[{"data":1,"prerenderedAt":18},["ShallowReactive",2],{"case-study-integrating-legal-and-technical-intelligence-securing-a-secondary-invalidation-breakthrough-for-a-litigated-expired-utility-model-patent":3},{"id":4,"title_en":5,"title_zh":6,"description_en":7,"description_zh":8,"content_en":9,"content_zh":10,"image":11,"is_published":12,"publish_date":13,"created_at":14,"updated_at":15,"slug":16,"is_recommended":17},"808c6dac-3199-49b3-b9c8-5f757aeac6f6","Integrating Legal and Technical Intelligence: Securing a Secondary Invalidation Breakthrough for a Litigated Expired Utility Model Patent","法律与技术情报的深度重构：一起涉诉期满实用新型专利的二次无效突破","This case study demonstrates a breakthrough secondary invalidation against a litigated, expired utility model patent (CN205204852U) in aquarium purification by employing a deep restructuring of legal and technical intelligence. Facing the threat of retroactive infringement damages and a resilient defense matrix built around complex spatial topological features that survived previous invalidation attempts, the search strategy bypassed conventional keyword stacking. Instead, it combined historical supply chain context restoration—uncovering generic commercial terms like \"packings\" and \"film-hanging carriers\"—with targeted industrial design database filtering (Locarno 23-01) to visually locate key prior art (CN303340221S) displaying intersecting window apertures. Subsequent assignee tracking uncovered a corresponding prior art utility model (CN204588809U) drafted in obscure mechanical terminology that achieved full feature alignment with the surviving claims. This successful dismantling of the patentee's remaining legal defenses underscores the decisive value of historical context reconstruction, visual intelligence penetration, and rigorous search tactics in high-stakes intellectual property litigation.","本案例分析深入拆解了一起涉及水族净化领域涉诉期满实用新型专利（CN205204852U）的“二次无效”突破过程。该专利虽保护期届满，但权利人仍就存续期间发起侵权诉讼，且其在首轮无效中幸存的权利要求（限定了复杂的空间拓扑截面与连续螺纹贯通特征）构筑了极强的防御矩阵。针对历史数据流失、常规水族词汇脱节以及空间几何干涉特征无法被文本检索高效命中等痛点，团队放弃了机械词汇堆砌的传统路径，转而采用“历史语境复原与视觉穿透”的深度检索战术：通过复原十年前的供应链语境挖掘出“填料”、“挂膜载体”等底层商业俗称；借助洛迦诺分类号（23-01）筛选申请日之前的现有技术，在外观设计数据库中精准捕捉到直观呈现过流窗孔的关键证据（CN303340221S）；随后通过权利人横向追踪，成功调取到采用冷僻加工词汇描述的单件在先实用新型（CN204588809U），实现了对幸存权利要求全特征的精准对齐。本案成功打破了二次无效死局，彻底瓦解了涉诉专利的残存防线，展现了深度技术情报重构与严密战术路径在疑难知识产权诉讼中的决定价值。","\u003Cp>\u003Cstrong>I. Litigation Background, Target Patent, and Defense Challenges\u003C\u002Fstrong>\u003C\u002Fp>\u003Cp>In intellectual property litigation, initiating an invalidity request against a key patent serves as a critical defensive strategy. However, when a patent has already undergone multiple legal challenges, and its remaining claims are highly specific, conducting a second invalidity search often presents significant technical and informational hurdles.\u003C\u002Fp>\u003Cp>The target of this case was Utility Model Patent No. CN205204852U, titled \"Helical Bacterial Support,\" related to aquarium purification. While its 10-year protection period was set to expire in November 2025, the patent owner had filed an infringement lawsuit seeking retrospective damages for the patent's valid duration. Therefore, dismantling the remaining claim defenses was crucial to determine whether the requestor would face substantial past infringement liability.\u003C\u002Fp>\u003Cp>The patent's application date was November 1, 2015, making it 11 years old at the time of the case. Over this decade, technological shifts led to significant \"internet memory evaporation\"—the loss or blurring of historical data from market supply chain pages, industry forums, and early product technical documents.\u003C\u002Fp>\u003Cp>In a prior invalidity proceeding, the target patent was challenged, but only claim 1 was successfully invalidated. Claims 2, 3, and 4 remained valid. This surviving set of claims formed a resilient, multi-layered defense system, serving as the core basis for the patent owner's infringement litigation:\u003C\u002Fp>\u003Cul>\u003Cli>\u003Cp>The patent's core technical architecture disclosed a body made of mineral microporous ceramic. This body featured through-holes at both ends and multiple grooves on its side walls, with the through-holes and side wall grooves interconnecting.\u003C\u002Fp>\u003C\u002Fli>\u003Cli>\u003Cp>The surviving claim 2 further defined the spatial topology: the through-holes included a central main through-hole and uniformly distributed peripheral smaller through-holes. It specified that only the peripheral smaller through-holes fully interconnected with the outer grooves.\u003C\u002Fp>\u003C\u002Fli>\u003Cli>\u003Cp>Claim 3 further limited the multiple grooves to form a continuous helical structure.\u003C\u002Fp>\u003C\u002Fli>\u003C\u002Ful>\u003Cp>This combination of specific multi-channel honeycomb cross-sections, continuously machined helical grooves on the surface, and spatially intersecting features formed at tangential points, represented the core technical challenge for this invalidity request.\u003C\u002Fp>\u003Cp>\u003Cstrong>II. Strategic Evolution: Reconstructing Historical Context and Visual Search Paths\u003C\u002Fstrong>\u003C\u002Fp>\u003Cp>With a text corpus already thoroughly vetted by previous invalidation attempts, merely repeating conventional searches offered little incremental value. The breakthrough in this case stemmed from a composite search strategy that evolved from standard baseline methods to a deep analysis of technical behavior.\u003C\u002Fp>\u003Cp>\u003Cstrong>1. Baseline Strategy Feedback and Dynamic Evolution of Commercial Terminology\u003C\u002Fstrong>\u003C\u002Fp>\u003Cp>Initial search efforts strictly followed standard operating procedures for conventional searches. These involved comprehensive searches combining the target patent’s IPC classifications and keywords, along with FT classifications and keywords. The search covered frequently used industry terms like \"bacterial support,\" \"bio-ring,\" \"biochemical stick,\" and \"bacterial house.\" However, conventional search results revealed a reason why the previous invalidity attempt failed: the language used in historical patent documents did not fully reflect the market landscape from over a decade ago. At that time, numerous unique commercial terms were prevalent in the market, terms that significantly diverged from the patent's textual descriptions.\u003C\u002Fp>\u003Cp>The limitations of conventional approaches confirmed the inherent obscurity and search difficulty of this case. To overcome this, the search strategy shifted to a deep investigation of the actual market environment from ten years prior. By reconstructing the industry supply chain ecosystem of that era, the team unearthed a series of more fundamental, common commercial terms, such as \"packing material,\" \"filter media,\" and \"biofilm carrier.\" Logically combining these era-specific commercial product names expanded the search scope vertically beyond the narrow aquarium field, establishing a continuous historical context reconstruction thread throughout the case.\u003C\u002Fp>\u003Cp>\u003Cstrong>2. Dilemma of Search Expressions for Geometric Features and Targeted Filtering of Design Patents\u003C\u002Fstrong>\u003C\u002Fp>\u003Cp>After establishing a foundation of product terminology, textual searches attempted to translate the complex geometric interference relationships defined in claims 2 and 3 into search expressions. Geometric accidental interconnections resulting from machining (e.g., tangential intersection of grooves and holes, overlap of threads and through-holes) are highly random and inconsistently described in Chinese patent texts, a phenomenon still common in patent drafting today. Consequently, basic operator combinations like \"groove AND hole\" or \"thread AND through-hole\" yielded very low efficiency, generating significant noise and missed data. This was another reason the previous invalidation attempt failed.\u003C\u002Fp>\u003Cp>Given that three-dimensional spatial structural features are more effectively conveyed visually, the search strategy pivoted to focus on design patent databases. To avoid unfocused broad screening, the strategy incorporated highly targeted filtering mechanisms: it strictly limited Locarno design classification to 23-01 (fluid regulation, water purification equipment), set an application date threshold earlier than November 1, 2015, and combined these with the multiple potential product names identified earlier using OR logic. This tightly designed search process quickly screened and compressed a massive amount of design data into a high-quality, definitive sample pool.\u003C\u002Fp>\u003Cp>\u003Cstrong>3. Acquisition of Visual Evidence and Textual Loop Closure through Patentee Tracking\u003C\u002Fstrong>\u003C\u002Fp>\u003Cp>From the filtered pool of graphical samples, Design Patent No. CN303340221S, titled \"Microbial Carrier Filling Material,\" published on August 19, 2015, was successfully identified. Its main view and isometric view clearly and completely depicted a thin-walled tubular structure composed of multiple convex arcs connected end-to-end, with standard continuous helical grooves on its outer wall. The isometric view also visually showed that as the helical groove rotated downwards, its bottom directly cut through the peripheral thin-walled tube, spatially forming rows of regular, open flow-through windows. However, the related patent information used the purely industrial wastewater treatment term \"microbial carrier filling material,\" and its brief description lacked any textual record of internal flow channels. This successfully circumvented all searches based on aquarium-specific core keywords at the text level.\u003C\u002Fp>\u003Cp>To further reduce potential disputes regarding structural understanding during oral proceedings, the patentee of this design patent, Dalian Aite Fluid Control Co., Ltd., served as a lead for cross-tracking searches of their technical achievements. This tracking quickly closed the evidence loop from graphics to text, successfully retrieving the corresponding utility model patent, CN204588809U, filed on the same day and published earlier. This textual evidence had also been missed by conventional searches previously because its description and claims employed highly abstract and obscure academic mechanical processing terms, such as \"convex arcs connected end-to-end,\" \"multi-phase flow dynamic membrane,\" and \"inner rib cantilever end.\" Within this specialized language system, conventional aquarium filtration terms were completely absent. However, the specific embodiments section of its description clearly stated that when processing helical grooves on the outer wall of the thin-walled tubular structure, a portion of the maximum convex part of the convex arc would be removed, thereby forming through-holes between the bottom of the helical groove and two adjacent internal reinforcing ribs. At this point, both the peripheral channels interconnected with grooves (as defined in target patent claim 2) and the required helical structure (as in target patent claim 3) found an identical technical implementation in this prior utility model patent, enabling a successful full-feature comparison.\u003C\u002Fp>\u003Cp>\u003Cstrong>III. Industry Value: The Critical Role of Advanced Searching in Complex IP Litigation\u003C\u002Fstrong>\u003C\u002Fp>\u003Cp>This case successfully navigated a seemingly intractable second invalidation challenge, demonstrating the decisive value of professional technical intelligence in modern intellectual property litigation.\u003C\u002Fp>\u003Cp>When confronting complex cases that have already undergone legal challenges and exhausted conventional search avenues, simply relying on passive database indexing or mechanical keyword stacking often proves ineffective. The truly effective solution lies in elevating technical literature searching to the level of precise reconstruction of industry development history and historical market context.\u003C\u002Fp>\u003Cp>By making the investigation of the actual market landscape of the past a continuous strategic main thread, and transforming complex spatial geometric features into highly targeted design patent filtering and patentee tracking, this approach not only helped the requestor precisely dismantle the core remaining defenses of the contested patent but also reconfirmed that deep technical insight and rigorous search strategy are the core support for companies to shift from a defensive to a proactive position in intense IP confrontations.\u003C\u002Fp>","\u003Cp>\u003Cstrong>一、核心诉讼背景与目标专利的防御体系\u003C\u002Fstrong>\u003C\u002Fp>\u003Cp>在知识产权诉讼的常规抗辩中，针对关键专利发起无效宣告请求是最为核心的防御手段。然而，当一件专利已经历过多轮法律博弈且其余下权利要求极具针对性时，二次无效的检索工作往往面临极高的技术与信息壁垒。\u003C\u002Fp>\u003Cp>本案的目标专利为一件涉及水族净化领域的实用新型专利，专利号为CN205204852U，名称为一种螺旋细菌座。尽管该专利的10年保护期已于2025年11月届满，但由于权利人向请求人发起的侵权诉讼涉及该专利权有效存续期间的追溯赔偿，因此能否彻底瓦解其残存的权利防线，直接决定了请求人是否需要承担重大的过往侵权损害赔偿责任。\u003C\u002Fp>\u003Cp>从时间跨度来看，该案的申请日为2015年11月1日，距今已有11年之久。长达十余年的技术更迭，导致当年的大量市场供应链网页、行业论坛评测及早期的产品技术文档面临严重的互联网记忆蒸发，历史数据大量流失或模糊不清。\u003C\u002Fp>\u003Cp>在此前的第一轮无效宣告请求中，目标专利已历经攻击，但最终仅成功宣告权利要求1无效，权利要求2、3及4被维持有效。目标专利通过这套幸存的组合构筑了极具弹性的多重防御矩阵，成为权利人在诉讼中推进的核心底牌：\u003C\u002Fp>\u003Cul>\u003Cli>\u003Cp>技术架构难点在于，该专利公开了一种由矿物质微孔陶瓷制成的座体，两端设有贯穿的通孔，侧壁开设多道凹槽，且通孔与侧壁凹槽相互贯通。\u003C\u002Fp>\u003C\u002Fli>\u003Cli>\u003Cp>在前案中幸存的权利要求2进一步限定了空间拓扑结构，即通孔包括中部的主通孔以及均匀分布在周边的侧向小通孔，且明确限定仅有周边小通孔与外凹槽完全贯通。\u003C\u002Fp>\u003C\u002Fli>\u003Cli>\u003Cp>权利要求3则限定多道凹槽之间必须形成连续的螺纹结构。\u003C\u002Fp>\u003C\u002Fli>\u003C\u002Ful>\u003Cp>这种将特定多通道蜂窝截面与表面连续车削螺纹并在相切处形成空间几何洞穿的复合特征，构成了本次定点清除战役的主要技术瓶颈。\u003C\u002Fp>\u003Cp>\u003Cstrong>二、战术演进：历史语境复原与视觉穿透的检索路径\u003C\u002Fstrong>\u003C\u002Fp>\u003Cp>面对已被前案充分筛查过的文本库容，盲目的重复检索无法产生增量价值。本案最终的突破，得益于一套由常规基准策略向深度技术行为学演进的复合检索方案。\u003C\u002Fp>\u003Cp>\u003Cstrong>1. 基准策略的反馈与商业称谓的动态演进\u003C\u002Fstrong>\u003C\u002Fp>\u003Cp>在检索初始阶段，常规检索的标准作业流程被严格执行。通过目标专利的IPC分类号结合关键词以及使用极具特色的FT分类号结合关键词的检索策略进行大网合围，使用了包括细菌座、生物环、生化棒及细菌屋等行业高频商业俗称。然而，常规检索策略的检索结果证明了前案无效未果的原因之一：在历史专利文献中，目标专利所采用的语言并不能反映出十多年前市场的全貌，当年市场端存在着大量独特的特色称谓，这些词汇与目标专利的文本产生了严重的脱节。\u003C\u002Fp>\u003Cp>常规路径的受阻进一步印证了本案的隐蔽性与检索难度。为了打破这一局限，检索策略转向对当年真实市场环境的深度调查。通过复原十年前的行业供应链历史生态，一系列在当年更为本质的通俗商业称谓被挖掘出来，包括填料、滤料以及挂膜载体等。通过将这些极具时代特征的商业产品称谓进行逻辑或关系的矩阵式组合，检索视野成功从窄小的水族领域完成纵向延展，建立了一条贯穿全案始终的历史语境复原线索。\u003C\u002Fp>\u003Cp>\u003Cstrong>2. 几何特征的检索式困局与外观设计的靶向过滤\u003C\u002Fstrong>\u003C\u002Fp>\u003Cp>在确定了产品称谓基座后，文本检索尝试将权利要求2和3所限定的复杂几何干涉关系转化为检索式。由于通过机械加工导致的几何偶然穿透（如槽与孔的相切、螺纹与通孔的重叠）在中文专利的文本表述中具有极大的随机性与不规范性，这种现象在中文专利的书写习惯中至今普遍存在，因此诸如“槽 and 孔”、“螺纹 and 通孔”等基础算子组合的文本检索效率极低，产生了海量的噪音与漏网数据，也是前案无效未果的另一个原因。\u003C\u002Fp>\u003Cp>鉴于三维空间结构特征本质上更易被视觉直观呈现，检索战术做出了关键转向，将主攻方向调整为外观设计专利数据库。为了避免盲目的大面积扫网导致精力稀释，检索策略引入了极具针对性的过滤机制：将洛迦诺外观分类号严格限制在 23-01（流体调节、水净化设备），死卡申请日早于2015年11月1日的时间阀门，并使用前述调查得出的多个可能的产品称谓进行逻辑或配置过滤。这一紧凑的检索流程设计在极短时间内将海量的外观设计数据压缩至一个高质量的确定样本池中。\u003C\u002Fp>\u003Cp>\u003Cstrong>3. 视觉证据的获取与权利人追踪的文字闭环\u003C\u002Fstrong>\u003C\u002Fp>\u003Cp>在经过清洗的图形样本池中，一件于2015年8月19日公开的外观设计专利被成功拦截，案号为CN303340221S，产品名称为微生物载体填料。该外观设计的主视图和立体图清晰完整地展示了由多个凸圆弧首尾连接构成的薄壁管状结构，且其外壁具有标准的连续螺旋凹槽。其立体图更是直观呈现了螺旋槽在旋转下行过程中，其槽底直接切穿了外周的薄壁管体，在空间上形成了一排排有规律的开放式过流窗孔。但在相关专利信息中，其使用了纯粹的工业污水处理术语微生物载体填料，且其简要说明缺乏关于内部流道的文字记载，从而在文本层面完美绕开了所有基于水族核心词的筛查。\u003C\u002Fp>\u003Cp>为了进一步降低口审阶段关于结构认知的辩论空间，以该外观设计权利人大连爱特流体控制有限公司为线索，对其名下的技术成果进行了横向的追踪检索。这一追踪迅速实现了从图形到文字的证据闭环，成功调取出了同日申请并提前公告的对应实用新型专利CN204588809U。这件文本证据同样在过往无法被常规检索命中，是因为其说明书和权利要求书采用了高度抽象且冷僻的学术性机械加工词汇，例如凸圆弧首尾连接、多相流动态膜以及内肋条悬臂端。在这些专业语言中，常规的水族过滤领域词汇完全不复存在。然而其说明书具体实施方式部分明确指出，在薄壁管状结构外壁上加工螺旋槽时，就会把凸圆弧最大凸出部切除一部分，形成螺旋槽底部与两个相邻内筋板之间的通孔。至此，目标专利权利要求2所声称的周边通道与凹槽贯通，以及权利要求3所要求的螺纹结构，在这一件单件在先实用新型专利中找到了完全一致的工艺技术并实现了全特征对齐。\u003C\u002Fp>\u003Cp>\u003Cstrong>三、行业价值：高阶检索在疑难知识产权诉讼中的锚定效应\u003C\u002Fstrong>\u003C\u002Fp>\u003Cp>本案从看似毫无空间的二次无效死局中成功突围，其过程充分展现了专业级技术情报刺探在现代知识产权诉讼中的决定性价值。\u003C\u002Fp>\u003Cp>在面对已经历过法律洗礼、常规检索通路被基本穷尽的深水区案件时，单纯依赖数据库的被动索引或机械的词汇堆砌往往无功而返。真正有效的解决路径，在于能够将技术文献的检索上升到对行业发展史和历史市场语境的精准复原。\u003C\u002Fp>\u003Cp>通过将对当年市场真实面貌的调查作为贯穿始终的策略轴线，将复杂的空间几何特征转化为极具针对性的外观设计过滤与权利人主体追踪，不仅协助请求人定点清除了涉诉专利的残存核心防线，也再次证明了深度的技术洞察与严密的检索战术安排，才是帮助企业在知识产权极限对抗中化被动为主动的最核心护航力量。\u003C\u002Fp>","",true,"2026-06-08","2026-08-11T08:59:29.261053+00:00","2026-08-11T09:02:23.582258+00:00","integrating-legal-and-technical-intelligence-securing-a-secondary-invalidation-breakthrough-for-a-litigated-expired-utility-model-patent",false,1787025713557]