Prosecution Insights
Last updated: October 26, 2026

Sheng Han Davis, USPTO Patent Examiner

Listed by the USPTO as DAVIS, SHENG HAN

Tech Center 2800 • Art Units: 1726 1732 1736 1793 2881

This examiner grants 66% of resolved cases

Analysis

Sheng Han Davis has 1101 resolved cases in Tech Center 2800 and Art Unit 1726. The allowance rate is 66.3%, with a median of 1167 days to allowance. The large resolved record supports a moderate allowance assessment, while the median timeline reflects prosecution that commonly extends beyond a year.

Interviews are associated with a 33.1% lift. Applicants may therefore consider early examiner engagement when technical distinctions or amendment options need to be tested. The leading companies are Johnson Matthey, BASF Mobile Emissions Catalysts, and BASF. BakerHostetler, JCIPRNET, and OLIFF are the listed leading firms.

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

Performance Statistics

66.3%
Allow Rate
-1.7% vs TC avg
1,177
Total Applications
+33.1%
Interview Lift
1167
Avg Prosecution Days
Based on 1101 resolved cases, 2023–2026

Rejection Statute Breakdown

0.3%
§101 Eligibility
6.9%
§102 Novelty
65.5%
§103 Obviousness
20.3%
§112 Clarity

Currently Pending Office Actions

App #TitleStatusAssignee
18113285 Nano-thin BixOySez low-temperature oxygen transporter membrane for oxygen transport, separation, and two-dimensional (2D) material manipulation Non-Final OA The Government of the United States of America, as represented by the Secretary of the Navy
18550378 PROCESS FOR MAKING PARTICULATE OXYHYDROXIDE OR OXIDES Non-Final OA BASF SE
18010222 Zeolite-Containing SCR Catalyst Final Rejection BASF MOBILE EMISSIONS CATALYSTS LLC
18000301 METHOD OF PREPARING A COPPER-PROMOTED ZEOLITE Non-Final OA BASF MOBILE EMISSIONS CATALYSTS LLC
17608184 SELECTIVE CATALYTIC REDUCTION CATALYST COMPRISING COPPER CARBONATE Non-Final OA BASF MOBILE EMISSIONS CATALYSTS LLC
18636020 SEPARATION OF METAL IONS BY LIQUID-LIQUID EXTRACTION Non-Final OA THE REGENTS OF THE UNIVERSITY OF CALIFORNIA
18276248 PELLICLE MEMBRANE FOR A LITHOGRAPHIC APPARATUS AND METHOD Final Rejection ASML NETHERLANDS B.V.
18291831 COMPOSITE COMPRISING ORGANOMETAL NANOSTRUCTURE POWDER AND METHOD FOR PREPARING SAME Non-Final OA LG CHEM, LTD.
18176465 MFI ZEOLITE OF HIGHLY DISPERSED FRAMEWORK ALUMINUM AND ITS USES FOR SELECTIVE AROMATICS METHYLATION TO PARA-XYLENE Final Rejection UOP LLC
18409927 CATALYST COMPOSITION Non-Final OA JOHNSON MATTHEY PUBLIC LIMITED COMPANY
18067932 COMPRESSED NATURAL GAS COMBUSTION AND EXHAUST SYSTEM Final Rejection Johnson Matthey Public Limited Company
18050067 CATALYSTS FOR GASOLINE EXHAUST GAS TREATMENTS WITH IMPROVED AMMONIA EMISSION CONTROL Final Rejection Johnson Matthey Public Limited Company

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Frequently Asked Questions

What is examiner Sheng Han Davis's allowance rate?

66.3% of resolved applications examined by Sheng Han Davis were allowed (1,101 resolved cases), compared with 35.4% across Art Unit 1726 over the last five years.

Does an interview help with examiner Sheng Han Davis?

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 Sheng Han Davis take to allow a patent?

Applications allowed by Sheng Han Davis took 1,167 days on average from filing to allowance.

Which art unit does examiner Sheng Han Davis work in?

Sheng Han Davis examines applications in Art Unit 1726 in Tech Center 2800 (Semiconductors, Circuits & Optics).

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