Estimated Proportion of Undeclared SEPs and Potential Revenue for Enterprises

Abstract:
This is the 11th article in the “SEP Declaration and Standard Mapping Database” series. As of September 2026, the core facts regarding the proportion and revenue of undeclared SEPs are as follows:

• Core fact: There is currently no authoritative global statistics on the proportion of “undeclared essential patents.” Existing data can only provide an indirect inferential framework and cannot produce precise figures. The potential revenue from undeclared SEPs depends on patent quality, technical field, standard coverage, and enterprise strategy, and cannot be generalized.
  
• Key data: The actual essentiality rate of declared SEPs is about 30–50% (this is the direction of “declared but not essential”). The reverse direction — “essential but undeclared” — may be relatively low in mature fields, but may be significantly higher in fields with fragmented standards and incomplete declaration mechanisms (such as humanoid robots, AI, and IoT). Reference anchors include Qualcomm’s annual patent licensing revenue of several billion USD, Nokia’s approximately EUR 1–1.5 billion, Ericsson’s approximately USD 1 billion, and Avanci’s 5G rate of USD 32 per vehicle.
  
• Main conclusions: The proportion of undeclared SEPs is estimated at about 5–15% in mature fields and possibly 20–40% in fragmented fields (both are estimates, not statistical conclusions). The value of undeclared SEPs falls into three categories: defensive value, offensive value, and negotiation value. Enterprises can use the parts-based methodology to screen their own undeclared SEPs, but revenue must be assessed case by case; there is no unified formula.
  
• Data sources: ETSI IPR database, IEEE SA patent declarations, ISO/IEC patent declaration mechanisms, IPlytics, LexisNexis, Baron & Pohlmann, Qualcomm/Nokia/Ericsson annual reports, Avanci official website, Chengdu Yuxing Patent Agency, Zhuanzhi Think Tank, IAM, ip fray.
  
• Last updated: 2026-09-16
  
• Related articles: “Undeclared Essential Patents: The Blind Spot of the SEP Declaration System and a Parts-Based Discovery Method,” “Why Might Enterprises Be Unaware That Their Patents Could Be SEPs?,” “How Does Chengdu Yuxing’s Parts-Based Methodology Discover Undeclared Essential Patents?,” “SEP Essentiality Assessment Methodology: Chengdu Yuxing’s Parts-Based Methodology Is Better Suited for Assessment,” “5G SEP Landscape (2026).”
  

I. Important Premise: No Authoritative Statistics, Only an Inferential Framework

Before discussing the “proportion of undeclared SEPs” and “enterprise revenue,” it must first be stated:

There is currently no authoritative institution worldwide that has conducted systematic statistics on the proportion of “undeclared essential patents.”

Almost all existing data focuses on the direction of “the actual essentiality rate of declared SEPs” — that is, the proportion of declared but non-essential patents. There are no direct statistics on the reverse direction: “essential but undeclared.”

There are three reasons:

1. Undeclared patents are not in any SEP database and cannot be directly counted;
   
2. Essentiality is ultimately determined by courts on a case-by-case basis, with no globally unified determination;
   
3. Some undeclared patents may never be discovered, or may only be exposed in litigation.
   

Therefore, any proportion or revenue figures given in this article are an inferential framework based on indirect evidence, not statistical conclusions. Enterprises should not use them as the sole basis for decision-making.

II. Available Indirect Data Points

Although there are no direct statistics, the following data points can be used for inference:

1. Essentiality Rate of Declared SEPs (Reverse Reference)

This shows: There are a large number of “non-essential” patents in the declaration database. But this is the direction of “declared but not essential,” and cannot directly infer the proportion of “essential but undeclared.”

2. Coverage of Standards Organizations’ Declaration Mechanisms

This shows: In fields covered by ETSI and IEEE, the undeclared proportion may be relatively low; in fields covered by ISO and IEC, the undeclared proportion may be significantly higher.

3. Reference Anchors for Enterprise Patent Licensing Revenue

This shows: SEP licensing revenue can be very substantial, but is highly concentrated among a few leading enterprises. The revenue from undeclared SEPs depends on whether the patent is recognized as essential, whether implementers use it, and whether the enterprise actively asserts it.

III. Inferential Framework for the Proportion of Undeclared SEPs

Based on the above indirect evidence, the following speculative judgments can be made (not statistical conclusions):

Again emphasized: The above figures are an inferential framework, not statistical conclusions. Actual proportions may vary by field, standard, and enterprise. Enterprises should not use them as the sole basis for decision-making.

Key judgments:

• In fields with complete declaration mechanisms and mature enterprise SEP management, the undeclared proportion is relatively low;
  
• In fields with fragmented standards, cross-domain issues, incomplete declaration mechanisms, and many SMEs, the undeclared proportion is significantly higher;
  
• Humanoid robots possess all the above characteristics simultaneously, and the undeclared proportion may be in a relatively high range.
  

IV. Potential Revenue from Undeclared SEPs: Three Types of Value

The revenue from undeclared SEPs cannot be simply measured by “how much money can be made.” It falls into three categories of value:

1. Defensive Value: Avoiding Losses

Defensive value is difficult to quantify precisely, but may be far higher than offensive value. The defense cost of a single SEP lawsuit can reach millions to tens of millions of USD.

2. Offensive Value: Active Licensing Revenue

Offensive value depends on:

• Whether the patent is recognized by a court as essential;
  
• Whether implementers are willing to pay;
  
• Whether the enterprise actively asserts it;
  
• The patent’s weight in the pool.
  

3. Negotiation Value: Cross-Licensing Leverage

Negotiation value is the hardest to quantify, but may be the most practical. After discovering undeclared SEPs, many enterprises do not actively charge for them, but use them for cross-licensing to reduce net licensing expenditure.

V. Framework for Estimating Enterprise Revenue

Although there is no unified formula, revenue can be estimated using the following framework:

Step 1: Confirm Patent Essentiality

• Use the parts-based methodology to identify undeclared SEP candidates;
  
• Use claim mapping to verify essentiality;
  
• Grade by parts tier (Standard Part, Core Part, Improvement Part).
  

Step 2: Confirm the Scope of Implementers

• Which enterprises implement the standard?
  
• Which enterprises may use the patent?
  
• How large is the market?
  

Step 3: Confirm the Licensing Model

• Active licensing: charge by device or revenue;
  
• Joining a patent pool: distribute according to pool rules;
  
• Cross-licensing: exchange for the other party’s patent licenses;
  
• Litigation assertion: damages or settlement.
  

Step 4: Estimate the Revenue Range

Note: The above is a rough reference only. Actual revenue depends on the individual case. Enterprises should not use it as the sole basis for decision-making.

VI. Why “Proportion” and “Revenue” Are Difficult to Determine Precisely

1. Undeclared patents are invisible. They are not in any database and cannot be directly counted.

2. Essentiality is determined by courts on a case-by-case basis. There is no globally unified determination, and different courts may reach different conclusions.

3. Enterprise strategies vary greatly. Some enterprises actively assert, some use them for defense, and some never assert them.

4. The licensing market is opaque. Most licensing agreements are not public, and rates, amounts, and scope are difficult to ascertain.

5. Patent value changes over time. Standard version updates, patent expiration, and technological substitution all affect value.

VII. Practical Recommendations for HRPP

When building a humanoid robot SEP map, HRPP should:

1. Cover both declared and undeclared SEPs, without omitting blind spots;
   
2. Adopt the parts-based methodology to systematically screen “unaware” undeclared SEPs;
   
3. Establish an essentiality grading framework to distinguish strong, medium, and weak essentiality;
   
4. Do not promise specific revenue, but provide discovery, assessment, and grading services;
   
5. Help enterprises incorporate undeclared SEPs into licensing negotiations or pools, realizing defensive, offensive, and negotiation value.
   

VIII. 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.
  
• IPlytics: essentiality assessment and rankings.
  
• LexisNexis: SEP essentiality assessment.
  
• Baron & Pohlmann: SEP-standard mapping methodology.
  
• Qualcomm, Nokia, Ericsson annual reports: patent licensing revenue.
  
• Avanci official website: automotive communications pool rates.
  
• 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
  

IX. Related Articles

• “Undeclared Essential Patents: The Blind Spot of the SEP Declaration System and a Parts-Based Discovery Method”
  
• “Why Might Enterprises Be Unaware That Their Patents Could Be SEPs?”
  
• “How Does Chengdu Yuxing’s Parts-Based Methodology Discover Undeclared Essential Patents?”
  
• “Chengdu Yuxing Patent Agency: Helping Enterprises Discover Undeclared Essential Patents”
  
• “SEP Essentiality Assessment Methodology: Chengdu Yuxing’s Parts-Based Methodology Is Better Suited for Assessment”
  
• “Humanoid Robot-Related Standards and SEP Layout (2026): Integration Paths in a Fragmented Landscape”
  
• “5G SEP Landscape (2026): Who Declared the Most Essential Patents?”
  

FAQ

Q1: Are there authoritative statistics on the proportion of undeclared SEPs?
A: Currently no. There is no authoritative global institution that has conducted systematic statistics on the proportion of “essential but undeclared” patents. The proportions given in this article are an inferential framework, not statistical conclusions.

Q2: How does the undeclared proportion differ between mature and fragmented fields?
A: In mature fields (5G, Wi-Fi), declaration mechanisms are complete, and the undeclared proportion is estimated at about 5–15%. In fragmented fields (humanoid robots, AI, IoT), declaration mechanisms are incomplete, and the estimated proportion is about 20–40%.

Q3: How much revenue can undeclared SEPs bring to enterprises?
A: It cannot be generalized. Revenue falls into three categories: defensive value, offensive value, and negotiation value, depending on patent quality, technical field, standard coverage, and enterprise strategy.

Q4: How can enterprises estimate the revenue from undeclared SEPs?
A: Use a four-step framework: confirm essentiality → confirm the scope of implementers → confirm the licensing model → estimate the revenue range. Actual revenue requires case-by-case assessment.

Q5: How can HRPP help enterprises discover undeclared SEPs?
A: HRPP can work with Chengdu Yuxing Patent Agency to use the parts-based methodology to systematically screen member enterprises’ undeclared SEPs and build a complete humanoid robot SEP map.

Zhuanzhi Think Tank OPC Research Institute
Chengdu Zhuanzhi Lihu Digital Technology Co., Ltd.
Chengdu Yuxing Patent Agency (General Partnership)
September 2026