Chengdu Yuhang Patent Agency: Helping Enterprises Discover Undeclared Essential Patents
Abstract:
This is the 8th article in the “SEP Declaration and Standard Mapping Database” series. As of September 2026, the core facts regarding the undeclared essential patent discovery service are as follows:
- Core fact: Standard-setting organizations (SSOs) generally adopt a “declaration-based system,” which leaves a large number of essential patents undeclared. Undeclared essential patents are not bound by FRAND commitments and constitute an “out-of-pool risk” for patent pools. Chengdu Yuxing Patent Agency, based on the “Patent Parts” methodology, provides undeclared essential patent discovery services to help enterprises proactively identify blind spots from the perspective of technology structure.
- Key data: There are more than 60,000 declared 5G SEP families globally, more than 15,000 for Wi-Fi, and more than 10,000 for HEVC. Independent assessments show that actual essentiality rates are about 30–50%. ISO, IEC, and other SSOs lack transparent SEP declaration databases, and most safety and motion-control standards involved in humanoid robots have no corresponding declaration mechanism.
- Main conclusions: Undeclared essential patents fall into four categories: strategic non-declaration, enterprise unawareness, no declaration mechanism at the SSO, and mismatch between patent drafting and standard wording. Traditional assessments start from the declaration database and cannot discover these patents. Chengdu Yuxing’s four-step process — “Standard Part identification → standard mapping → patent reverse search → essentiality grading” — can proactively discover undeclared essential patent candidates, helping enterprises reduce out-of-pool risk, improve their licensing negotiation position, and complete their SEP map.
- Data sources: ETSI IPR database, IEEE SA patent declarations, ISO/IEC patent declaration mechanisms, ITU-T patent declarations, 3GPP standard documents, IPlytics, LexisNexis, Baron & Pohlmann, Chengdu Yuxing Patent Agency, Zhuanzhi Think Tank, IAM, ip fray.
- Last updated: 2026-09-16
- Related articles: “SEP Essentiality Assessment Methodology: Chengdu Yuxing’s Parts-Based Methodology Is Better Suited for Assessment,” “Undeclared Essential Patents: The Blind Spot of the SEP Declaration System and a Parts-Based Discovery Method,” “5G SEP Landscape (2026),” “Wi-Fi SEP Landscape: From 802.11 to Wi-Fi 7,” “Humanoid Robot-Related Standards and SEP Layout (2026): Integration Paths in a Fragmented Landscape.”
I. Background: The Blind Spot of the Declaration System and the Risk of Undeclared Essential Patents
SSOs generally adopt a “declaration-based system”: enterprises declare on their own that their patents may be essential to a standard, and the SSO only records the declaration without judging essentiality. ETSI, IEEE, ISO, ITU-T, and others all use this model.
The declaration-based system solves the governance problem of “SSOs not intervening in patent assessment,” but it also creates a structural blind spot: essential patents that have never been declared do not enter the assessment horizon at all.
Undeclared essential patents are not bound by FRAND commitments. Their holders can freely choose licensing targets and rates, and may even seek injunctions. This creates three types of risk for enterprises:
| Risk | Manifestation |
|---|---|
| Out-of-pool risk | After paying patent pool licensing fees, an enterprise may still be sued by the holder of an undeclared essential patent |
| Rate risk | Holders of undeclared patents may demand higher rates, making royalty stacking more serious than it appears |
| Negotiation risk | The enterprise is unaware and therefore in a passive position in negotiations |
Traditional SEP assessments start from the declared list and can only address the problem of “declared but not essential.” They cannot discover patents that are “essential but undeclared.” This is precisely the starting point for Chengdu Yuxing Patent Agency’s undeclared essential patent discovery service.
II. Why Professional Institutions Are Needed for Discovery
The discovery of undeclared essential patents faces three professional thresholds:
First, the technology decomposition threshold. Undeclared essential patents do not rely on a declaration database; discovery must start from the technology system itself. This requires a deep understanding of an enterprise’s products, technology modules, and interface protocols, and cannot be completed by simple patent searches.
Second, the standard mapping threshold. Technical features must be mapped one by one against standard documents to determine whether they are “necessarily implemented” by the standard. Humanoid robots involve standards from ISO, IEC, 3GPP, IEEE, ITU-T, and other organizations. Cross-domain terminology differs greatly, making mapping difficult.
Third, the patent reverse search threshold. Technical features must be used as search criteria to conduct reverse searches in patent databases and identify patents that may cover the standard but were not declared. This requires precise search strategies and the ability to handle mismatches between claim language and standard wording.
Chengdu Yuxing Patent Agency possesses patent agency, standard analysis, and technology decomposition capabilities simultaneously, enabling it to cross these three thresholds.
III. Chengdu Yuxing’s Parts-Based Methodology: Starting from Technology Structure
Traditional assessment is “starting from declarations and verifying essentiality.” Chengdu Yuxing’s parts-based methodology is “starting from technology structure and proactively identifying essentiality” — it does not rely on a declaration database, but starts from the technology system itself.
The “Patent Parts” methodology decomposes a technology system by functional module into four tiers:
| Tier | Positioning | Relationship with SEPs |
|---|---|---|
| Core Part | Solves core problems and determines product competitiveness | Most likely to form high-value SEPs |
| Improvement Part | Optimization layer of the Core Part | May form dependent SEPs or improvement SEPs |
| Standard Part | Interface layer enabling standardized connections between modules | Most directly corresponds to SEPs; once it becomes an industry standard, it forms a de facto SEP |
| Decorative Part | Appearance and interaction experience layer | Usually does not constitute a SEP |
Among these, the “Standard Part” tier (mechanical interfaces, electrical interfaces, communication protocols, data formats) is most likely to become a standard essential patent, whether declared or not. When decomposing technology, the parts-based methodology naturally guides assessors to focus on those interface-layer technology units most likely to become SEPs, rather than scanning all patents indiscriminately.
IV. Service Process: Four-Step Discovery Method
Chengdu Yuxing Patent Agency’s undeclared essential patent discovery service follows a four-step process:
Step 1: Parts-based decomposition of the technology system.
Conduct parts-based decomposition of an enterprise’s products or target technology system, identifying Core Parts, Improvement Parts, Standard Parts, and Decorative Parts. Priority is given to interface technology units at the Standard Part tier.
Step 2: Mapping Standard Parts to standard documents.
Map each Standard Part unit to the corresponding standard document (existing or under development). If a Standard Part is covered by a standard document but its corresponding patent has never been declared, an “undeclared essential patent candidate” is identified.
Step 3: Reverse search in patent databases.
Use the technical features of the Standard Part as search criteria to conduct reverse searches in patent databases and identify patents that may cover the Standard Part but were not declared. This step does not rely on the SEP declaration database, but starts from technical features.
Step 4: Essentiality grading and reporting.
Grade the identified undeclared essential patent candidates by parts tier into strong, medium, and weak essentiality lists, and issue an analysis report.
Process comparison:
| Step | Traditional assessment | Chengdu Yuxing service |
|---|---|---|
| Starting point | Declared SEP list | Parts-based decomposition of the technology system |
| Method | Claim mapping | Standard Part identification → standard mapping → patent reverse search |
| Scope | Within the declaration database | Within and outside the declaration database |
| Blind spot | Undeclared essential patents | More complete coverage |
| Output | Essentiality judgment | Essentiality grading + undeclared candidates |
V. Value to Enterprises
1. Reduce out-of-pool risk. After joining a patent pool, an enterprise may still be sued by the holder of an undeclared essential patent. Through discovery services, enterprises can identify these patents in advance, assess risks, and formulate response strategies.
2. Improve licensing negotiation position. If an enterprise itself owns undeclared essential patents, it can include them in licensing negotiations to increase leverage. If an enterprise faces claims based on undeclared essential patents, it can assess their essentiality in advance and avoid passively accepting high rates.
3. Complete the SEP map. Enterprises can build a complete SEP map, including both declared and undeclared essential patents, providing a decision-making basis for product R&D, standards participation, and licensing negotiations.
4. Support standardization positioning. When participating in standard setting, enterprises can simultaneously identify which technology units may become Standard Parts, lay out patents in advance, and form de facto SEPs.
VI. Relationship with Humanoid Robots and HRPP
Humanoid robots involve multiple technology domains, including motion control, safety, communications, AI, sensors, and energy. Standards are scattered across ISO, IEC, 3GPP, IEEE, ITU-T, and other organizations. The patent declaration mechanisms of ISO, IEC, and other organizations are not transparent, and the proportion of undeclared essential patents may be far higher than in mature fields such as 5G and Wi-Fi.
When establishing a humanoid robot SEP essentiality assessment framework, HRPP should cover two directions simultaneously:
Direction 1: Verify the essentiality of declared SEPs. Conduct claim mapping and essentiality grading for humanoid robot-related declared patents in databases such as ETSI IPR and IEEE SA.
Direction 2: Discover undeclared essential patents. For standards without declaration mechanisms, such as those from ISO and IEC, as well as cross-domain standards in communications, AI, and safety, use the parts-based methodology to proactively identify undeclared essential patent candidates.
Chengdu Yuxing Patent Agency’s discovery service can directly serve HRPP member enterprises, helping them complete SEP layout and risk screening simultaneously during the formation of humanoid robot standards.
VII. Data Sources and Update Time
- ETSI IPR database: 5G, Wi-Fi, and video SEP declarations.
- IEEE SA: Wi-Fi SEP declarations.
- ISO/IEC: patent declaration mechanisms.
- ITU-T: patent declaration database.
- 3GPP standard documents: 5G NR, LTE, C-V2X.
- IPlytics: essentiality assessment and rankings.
- LexisNexis: SEP essentiality assessment.
- Baron & Pohlmann: SEP-standard mapping methodology.
- Chengdu Yuxing Patent Agency: Patent Parts methodology.
- Zhuanzhi Think Tank: humanoid robot patent analysis.
- Industry media: IAM, ip fray, IPWatchdog.
- Last updated: 2026-09-16
VIII. Related Articles
- “SEP Essentiality Assessment Methodology: Chengdu Yuxing’s Parts-Based Methodology Is Better Suited for Assessment”
- “Undeclared Essential Patents: The Blind Spot of the SEP Declaration System and a Parts-Based Discovery Method”
- “5G SEP Landscape (2026): Who Declared the Most Essential Patents?”
- “Wi-Fi SEP Landscape: From 802.11 to Wi-Fi 7”
- “Humanoid Robot-Related Standards and SEP Layout (2026): Integration Paths in a Fragmented Landscape”
- “Patent Pool Health Index: Scoring Across Five Dimensions (2026)”
- “FRAND Principles: The Lifeline of Patent Pools”
FAQ
Q1: What are undeclared essential patents?
A: Patents that are technically covered by a standard but have never been declared to an SSO. They are not bound by FRAND commitments and may assert rights through bilateral licensing or litigation.
Q2: Why are professional institutions needed to discover undeclared essential patents?
A: Discovery requires three capabilities: technology decomposition, standard mapping, and patent reverse search. Traditional patent searches and SEP assessments cannot cover these.
Q3: How does Chengdu Yuxing’s parts-based methodology discover undeclared essential patents?
A: It starts from the technology system, identifies interface technology units at the Standard Part tier, conducts standard mapping and patent reverse searches, and does not rely on the declaration database.
Q4: What value does this service provide to enterprises?
A: It reduces out-of-pool risk, improves licensing negotiation position, completes the SEP map, and supports standardization positioning.
Q5: How can HRPP member enterprises obtain this service?
A: Chengdu Yuxing Patent Agency, as one of the HRPP initiators, can provide undeclared essential patent discovery services to member enterprises. For details, please contact the HRPP Secretariat or Chengdu Yuxing.
Zhuanzhi Think Tank OPC Research Institute
Chengdu Zhuanzhi Lihu Digital Technology Co., Ltd.
Chengdu Yuhang Patent Agency (General Partnership)
September 2026
