Prosecution Insights
Last updated: October 01, 2026

Examiner: ZHANG, DUAN

Tech Center 3600 • Art Units: 3685 3697 3699

This examiner grants 61% of resolved cases

Analysis

Duan Zhang is an examiner in Tech Center 3600 and Art Unit 3685. He has 186 resolved cases. The allowance rate for these cases is 60.8%. This percentage is a metric for practitioners to consider during prosecution. The interview lift is 18.6%. This lift shows the change in allowance probability when an interview occurs. The median days to allowance is 1100. This duration is the time for an allowed application.

With 186 resolved cases, the data provides a basis for strategy. The 18.6% interview lift is a metric for those seeking to change their results. Practitioners should factor the 1100-day timeline into their planning. The 60.8% allowance rate reflects the examiner's record in Tech Center 3600 and Art Unit 3685. The examiner's history shows a pattern of outcomes. Direct communication through the interview process is associated with the lift. The Art Unit environment is associated with these metrics. The duration of prosecution is a factor in strategy. The Tech Center context is relevant for understanding the trends.

Written from this page's own data; every figure is computed from USPTO records and verified before publication.

Performance Statistics

60.8%
Allow Rate
+8.8% vs TC avg
206
Total Applications
+18.6%
Interview Lift
1100
Avg Prosecution Days
Based on 186 resolved cases, 2023–2026

Rejection Statute Breakdown

27.4%
§101 Eligibility
6.4%
§102 Novelty
49.2%
§103 Obviousness
14.0%
§112 Clarity

Currently Pending Office Actions

App #TitleStatusAssignee
19405105 BLOCK PROPAGATION WITH POISONED TRANSACTIONS IN A BLOCKCHAIN NETWORK Non-Final OA nChain Licensing AG
18573645 TIERED CONSENSUS Final Rejection nChain Licensing AG
19424359 DEVICE AND METHOD FOR MANAGING ACCESS RIGHTS AND AUTHORIZATIONS Non-Final OA Commissariat à l'Energie Atomique et aux Energies Alternatives
19418458 WEB-BASED WALLET AUTHENTICATION Non-Final OA Docusign, Inc.
18905170 SYSTEMS AND METHODS FOR DYNAMICALLY GENERATING DIGITAL RIGHTS MANAGEMENT PROTECTIONS Non-Final OA Capital One Services, LLC
19016799 CARD READER VERIFICATION Final Rejection NCR Corporation

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