Prosecution Insights
Last updated: October 26, 2026

Lei Zhang, USPTO Patent Examiner

Listed by the USPTO as ZHANG, LEI

Tech Center 3700 • Art Units: 3795 3798

This examiner grants 13% of resolved cases

Analysis

ZHANG, LEI has resolved 15 cases in Tech Center 3700 and Art Unit 3795. The allowance rate is 13.3%, while the interview lift is 100.0%. The median time to allowance is 994 days. The limited record reports a low allowance rate alongside a strong interview association, making interview preparation an important issue to evaluate without treating the figures as conclusive.

The principal companies are Samsung Electronics Co., Ltd., Canon Inc., and Fujifilm Corporation. The leading firms are Knobbe, Martens, Olson & Bear, LLP, OBLON, MCCLELLAND, MAIER & NEUSTADT, L.L.P., and Studebaker Brackett PLLC. These names provide useful references for applicants and counsel with relevant experience.

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

Performance Statistics

13.3%
Allow Rate
-56.7% vs TC avg
67
Total Applications
+100.0%
Interview Lift
994
Avg Prosecution Days
Based on 15 resolved cases, 2023–2026

Rejection Statute Breakdown

12.7%
§101 Eligibility
14.4%
§102 Novelty
46.5%
§103 Obviousness
26.4%
§112 Clarity

Currently Pending Office Actions

App #TitleStatusAssignee
19208501 ULTRASOUND PROBE Final Rejection FUJIFILM Corporation
18991701 IMAGE PROCESSING APPARATUS AND ACTUATION METHOD OF IMAGE PROCESSING APPARATUS Non-Final OA FUJIFILM Corporation
18386016 ELECTRONIC DEVICE INCLUDING SENSOR MODULE Final Rejection Samsung Electronics Co., Ltd.
17968282 WEARABLE ELECTRONIC DEVICE INCLUDING BIOMETRIC SENSOR FOR MEASURING BODY TEMPERATURE Non-Final OA SAMSUNG ELECTRONICS CO., LTD.
18460484 Heart Measurement Using Time-Varying Frequency Acoustic Techniques Final Rejection Apple Inc.
19535039 ULTRASONIC DIAGNOSTIC APPARATUS, IMAGE PROCESSING APPARATUS, METHOD, AND NON-TRANSITORY COMPUTER READABLE MEDIUM Non-Final OA Canon Kabushiki Kaisha
18132891 System and Method for Mapping an Anatomical Pathway Non-Final OA Bard Access Systems, Inc.
19004408 WEARABLE DISPLAY DEVICE Final Rejection Samsung Display Co., LTD.
18599936 WEARABLE COMPUTING DEVICE, SYSTEMS, AND METHOD FOR MEASURING SKIN AUTOFLUORESCENCE WITH AN OPTICAL SENSOR Non-Final OA Google LLC
19003311 COMPUTER PROGRAM, INFORMATION PROCESSING APPARATUS, AND INFORMATION PROCESSING METHOD Final Rejection TERUMO KABUSHIKI KAISHA
19190454 ULTRASOUND DIAGNOSTIC EQUIPMENT WITH IMAGING PARAMETERS ADJUSTMENT USING COMMENTS ENTERED BY OPERATOR Non-Final OA GE Precision Healthcare LLC
19058126 Patient Seat and Magnetic Resonance Device Final Rejection Siemens Healthineers AG
18356696 Method and System for Distinguishing Between Stone and Tissue with a Laser Non-Final OA LUMENIS LTD.
18524365 CATHETER AND METHOD FOR PRODUCING SUCH A CATHETER Non-Final OA B. Braun Melsungen AG
18251580 SYSTEMS AND METHODS FOR MEASURING ELECTRIC FIELD IN BIOLOGICAL TISSUES Non-Final OA Dignity Health

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Frequently Asked Questions

What is examiner Lei Zhang's allowance rate?

13.3% of resolved applications examined by Lei Zhang were allowed (15 resolved cases), compared with 61.2% across Art Unit 3795 over the last five years.

Does an interview help with examiner Lei Zhang?

This examiner's interview lift is +100.0 percentage points: the difference in allowance rate between resolved applications that had an examiner interview and those that did not.

How long does examiner Lei Zhang take to allow a patent?

Applications allowed by Lei Zhang took 994 days on average from filing to allowance.

Which art unit does examiner Lei Zhang work in?

Lei Zhang examines applications in Art Unit 3795 in Tech Center 3700 (Medical Devices & Mechanical Engineering).

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