Prosecution Insights
Last updated: October 26, 2026

Weihua Fan, USPTO Patent Examiner

Listed by the USPTO as FAN, WEIHUA

Tech Center 1600 • Art Units: 1662 1663

This examiner grants 83% of resolved cases

Analysis

FAN, WEIHUA is assigned to technology center 1600 and art unit 1662. The profile includes 663 resolved cases, a 83.3% allowance rate, an interview lift of 12.7%, and a median of 934 days to allowance. The substantial case history and favorable allowance outcome indicate a consistent prosecution pattern, while the interview measure shows a limited positive association.

Enza Zaden Beheer B.V., Pioneer Hi-bred International Inc., and University of Massachusetts are among the listed companies. The principal firms are ARENTFOX SCHIFF LLP, FOLEY HOAG, LLP (General), and Clark+Elbing LLP. Practitioners can use interviews for clarification but should continue to emphasize precise written claim presentation. The median timing supports advance planning for prosecution milestones despite the favorable historical allowance measure.

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

Performance Statistics

83.3%
Allow Rate
+23.3% vs TC avg
700
Total Applications
+12.7%
Interview Lift
934
Avg Prosecution Days
Based on 663 resolved cases, 2023–2026

Rejection Statute Breakdown

9.5%
§101 Eligibility
12.0%
§102 Novelty
22.6%
§103 Obviousness
40.3%
§112 Clarity

Currently Pending Office Actions

App #TitleStatusAssignee
17351374 METHOD FOR TREATING POST-EMERGENT RICE Non-Final OA BASF SE

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Frequently Asked Questions

What is examiner Weihua Fan's allowance rate?

83.3% of resolved applications examined by Weihua Fan were allowed (663 resolved cases), compared with 63.0% across Art Unit 1662 over the last five years.

Does an interview help with examiner Weihua Fan?

This examiner's interview lift is +12.7 percentage points: the difference in allowance rate between resolved applications that had an examiner interview and those that did not.

How long does examiner Weihua Fan take to allow a patent?

Applications allowed by Weihua Fan took 934 days on average from filing to allowance.

Which art unit does examiner Weihua Fan work in?

Weihua Fan examines applications in Art Unit 1662 in Tech Center 1600 (Biotechnology & Pharmaceuticals).

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