Prosecution Insights
Last updated: October 26, 2026

May Leung Chiu, USPTO Patent Examiner

Listed by the USPTO as CHIU, MAY LEUNG

Tech Center 1700 • Art Units: 1693 1758 1797

This examiner grants 43% of resolved cases

Analysis

CHIU, MAY LEUNG works in Tech Center 1700 and Art Unit 1693. The profile includes 30 resolved cases, with a 43.3% allowance rate and a median of 1305 days to allowance. Interviews show a 26.1% lift, providing a positive association in a relatively limited record.

Hitachi Ltd., Roche Diagnostics Operations Inc., and 10x Genomics Inc. are the listed leading companies. Taft Law, Apex Attorneys at Law, LLP, and CAESAR RIVISE, PC are the listed leading firms. Practitioners should account for the reported duration and use the interview measure as a case-specific planning input.

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

Performance Statistics

43.3%
Allow Rate
-21.7% vs TC avg
80
Total Applications
+26.1%
Interview Lift
1305
Avg Prosecution Days
Based on 30 resolved cases, 2023–2026

Rejection Statute Breakdown

0%
§101 Eligibility
28.5%
§102 Novelty
40.2%
§103 Obviousness
27.5%
§112 Clarity

Currently Pending Office Actions

App #TitleStatusAssignee
18177562 FLOW FOCUSING DEVICES, SYSTEMS, AND METHODS FOR HIGH THROUGHPUT DROPLET FORMATION Final Rejection 10x Genomics, Inc.
18634178 Microfluidic Devices with Reusable Components Non-Final OA TDK Corporation
17999677 MAGNETOFLUIDIC CARTRIDGES, DEVICES AND RELATED METHODS OF SAMPLE ANALYSIS Non-Final OA THE JOHNS HOPKINS UNIVERSITY
18489182 DEVICES AND METHODS FOR SPECTROSCOPY OF BIOMATERIALS AND LIVE CELLS Non-Final OA The Regents of the University of California
18706851 Automated Analysis Device Non-Final OA Hitachi High-Tech Corporation
18570161 SEPTUM Non-Final OA HITACHI HIGH-TECH CORPORATION
18719936 PURIFICATION APPARATUS Non-Final OA SHIMADZU CORPORATION

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Frequently Asked Questions

What is examiner May Leung Chiu's allowance rate?

43.3% of resolved applications examined by May Leung Chiu were allowed (30 resolved cases), compared with 59.4% across Art Unit 1693 over the last five years.

Does an interview help with examiner May Leung Chiu?

This examiner's interview lift is +26.1 percentage points: the difference in allowance rate between resolved applications that had an examiner interview and those that did not.

How long does examiner May Leung Chiu take to allow a patent?

Applications allowed by May Leung Chiu took 1,305 days on average from filing to allowance.

Which art unit does examiner May Leung Chiu work in?

May Leung Chiu examines applications in Art Unit 1693 in Tech Center 1700 (Chemistry & Materials).

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