Prosecution Insights
Last updated: October 26, 2026

Changqing Li, USPTO Patent Examiner

Listed by the USPTO as LI, CHANGQING

Tech Center 1700 • Art Units: 1791 1793

This examiner grants 29% of resolved cases

Analysis

LI, CHANGQING is assigned to Tech Center 1700 and Art Unit 1791. His profile includes 319 resolved cases, a 29.2% allowance rate, and a median of 1340 days to allowance. Interviews show a 33.1% lift. The contrast between the allowance rate and interview measure makes focused interview preparation a potentially important tool for addressing substantive objections.

Representative companies include Ajinomoto Co., Inc., Roquette Freres, and Archer Daniels Midland Company. The leading firms are Knobbe, Martens, Olson & Bear, LLP, FITCH EVEN TABIN & FLANNERY, LLP, and Element IP, PLC. The median timing supports early planning for prosecution persistence, with interviews coordinated to specific claim and evidence issues.

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

Performance Statistics

29.2%
Allow Rate
-35.8% vs TC avg
410
Total Applications
+33.1%
Interview Lift
1340
Avg Prosecution Days
Based on 319 resolved cases, 2023–2026

Rejection Statute Breakdown

2.4%
§101 Eligibility
11.5%
§102 Novelty
51.8%
§103 Obviousness
29.0%
§112 Clarity

Currently Pending Office Actions

App #TitleStatusAssignee
18722527 COAGULANT FOR PRODUCING BEAN CURD AND BEAN CURD PRODUCED USING THE SAME Final Rejection CJ CHEILJEDANG CORPORATION
17551163 NATIVE EDESTIN PROTEIN ISOLATE AND USE AS A TEXTURIZING INGREDIENT Final Rejection Steuben Foods, Inc.
18855014 PROCESS FOR TREATING PROTEIN-CONTAINING COMPOSITIONS Non-Final OA SOCIETE DES PRODUITS NESTLE S.A.
18565676 FOOD OR BEVERAGE INGREDIENT COMPOSITION Final Rejection SOCIETE DES PRODUITS NESTLE S.A.
17785171 ISOLATED OLEOSOME COMPOSITION AND PROCESS FOR PREPARING IT Final Rejection CARGILL, INCORPORATED
19107332 ANIMAL NUTRITIONAL COMPOSITION Non-Final OA RaceHorse Incorporated
18580960 LACTOCOCCUS STRAINS Non-Final OA INTERNATIONAL N&H DENMARK APS
18549097 METHODS OF BINDING INGREDIENTS OF MEAT ANALOG PRODUCTS Non-Final OA Archer Daniels Midland Company
18547984 STRETCHABLE CHEESE ALTERNATIVE PRODUCING METHOD Final Rejection AMANO ENZYME INC.
18245627 METHOD OF MANUFACTURING PROCESSED CHICKPEA MILK Final Rejection AMANO ENZYME INC.

Facing This Examiner?

IP Author analyzes examiner patterns and generates tailored response strategies with the highest chance of allowance.

Build Your Strategy

Who Appears Before This Examiner

Top companies before this examiner

Law firms appearing most often

Frequently Asked Questions

What is examiner Changqing Li's allowance rate?

29.2% of resolved applications examined by Changqing Li were allowed (319 resolved cases), compared with 26.2% across Art Unit 1791 over the last five years.

Does an interview help with examiner Changqing Li?

This examiner's interview lift is +33.1 percentage points: the difference in allowance rate between resolved applications that had an examiner interview and those that did not.

How long does examiner Changqing Li take to allow a patent?

Applications allowed by Changqing Li took 1,340 days on average from filing to allowance.

Which art unit does examiner Changqing Li work in?

Changqing Li examines applications in Art Unit 1791 in Tech Center 1700 (Chemistry & Materials).

Sign in with your work email

Enter your email to receive a magic link. No password needed.

Personal email addresses (Gmail, Yahoo, etc.) are not accepted.

Free tier: 3 strategy analyses per month