Prosecution Insights
Last updated: October 26, 2026

Surbhi M Du, USPTO Patent Examiner

Listed by the USPTO as DU, SURBHI M

Tech Center 2800 • Art Units: 1732 1763 1765 2815

This examiner grants 67% of resolved cases

Analysis

In Tech Center 2800 and Art Unit 1732, DU, SURBHI M has resolved 121 cases. The allowance rate is 66.9%, with an interview lift of 29.1%. The median time to allowance is 1175 days. The smaller resolved portfolio shows a moderate allowance result and a meaningful interview association, while the median timeline indicates that applicants should plan for continued prosecution.

The leading companies are Eastman Chemical Company, Pi Advanced Materials Co. Ltd., and Samsung Electronics Co., Ltd. The leading firms are BIRCH STEWART KOLASCH & BIRCH, LLP, DORITY & MANNING, P.A., and THE WEBB LAW FIRM, P.C. Interviews may be useful for clarifying technical distinctions, provided they are supported by focused written amendments and explanations.

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

Performance Statistics

66.9%
Allow Rate
-1.1% vs TC avg
174
Total Applications
+29.1%
Interview Lift
1175
Avg Prosecution Days
Based on 121 resolved cases, 2023–2026

Rejection Statute Breakdown

0.2%
§101 Eligibility
17.7%
§102 Novelty
57.6%
§103 Obviousness
18.1%
§112 Clarity

Currently Pending Office Actions

App #TitleStatusAssignee
17742667 COMPOUND FOR FORMING HARDMASK, HARDMASK COMPOSITION INCLUDING THE COMPOUND, AND METHOD OF MANUFACTURING INTEGRATED CIRCUIT DEVICE USING THE HARDMASK COMPOSITION Final Rejection SAMSUNG ELECTRONICS CO., LTD.
18280081 DIELECTRIC MATERIALS BASED ON AMIDE-IMIDE-EXTENDED BISMALEIMIDES Non-Final OA MERCK PATENT GMBH
18709528 OPTICAL FILM AND METHOD OF PREPARING SAME Non-Final OA KOLON INDUSTRIES, INC.
18294426 ANTIPATHOGENIC NANOSTRUCTURES Non-Final OA THE BOEING COMPANY
18265268 ALKOXYLATED POLYMERIC N-(HYDROXYALKYL)AMINE AS WETTING AGENTS AND AS A COMPONENT OF DEFOAMER COMPOSITIONS Non-Final OA BASF SE
18013436 COATING COMPOSITION WITH HIGH SOLIDS CONTENT, AND METHOD FOR FORMING MULTILAYER COATING FILM Non-Final OA KANSAI PAINT CO., LTD.
18456592 MELTABLE FLUORORESIN PRIMER Final Rejection DAIKIN INDUSTRIES, LTD.
17560033 BIO-ELECTRODE COMPOSITION, BIO-ELECTRODE, AND METHOD FOR MANUFACTURING BIO-ELECTRODE Final Rejection SHIN-ETSU CHEMICAL CO., LTD.
18287607 AMIDOAMINE COMPOSITION AND ADHESIVE COMPOSITION CONTAINING THE SAME Non-Final OA Evonik Operations GmbH
18800424 METHODS OF CURING COMPOSITIONS BASED ON MULTISTAGE POLYMERS Final Rejection Arkema France
18708362 RECYCLABLE COPOLYESTERS ARTICLES WITH LIVING HINGES Non-Final OA Eastman Chemical Company
18247896 POLYESTER POLYOL COMPOSITIONS FOR METAL PACKAGING COATINGS Final Rejection Eastman Chemical Company
18712506 Polycarbonate Resin and Method for Producing Same Non-Final OA LG Chem, Ltd.
18032474 Process For Preparing Polyether Alcohols Having A Low Metal Ion Content Final Rejection Clariant International Ltd.

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Frequently Asked Questions

What is examiner Surbhi M Du's allowance rate?

66.9% of resolved applications examined by Surbhi M Du were allowed (121 resolved cases), compared with 53.6% across Art Unit 1732 over the last five years.

Does an interview help with examiner Surbhi M Du?

This examiner's interview lift is +29.1 percentage points: the difference in allowance rate between resolved applications that had an examiner interview and those that did not.

How long does examiner Surbhi M Du take to allow a patent?

Applications allowed by Surbhi M Du took 1,175 days on average from filing to allowance.

Which art unit does examiner Surbhi M Du work in?

Surbhi M Du examines applications in Art Unit 1732 in Tech Center 2800 (Semiconductors, Circuits & Optics).

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