Prosecution Insights
Last updated: October 25, 2026

Len Tran, USPTO Patent Examiner

Listed by the USPTO as TRAN, LEN

Tech Center 3700 • Art Units: 3744 3752 3763

This examiner grants 16% of resolved cases

Analysis

TRAN, LEN works in Tech Center 3700 and Art Unit 3744. The profile records 122 resolved cases, an allowance rate of 15.6%, and an interview lift of 25.2%. The median time to allowance is 1279 days. The combination shows a relatively limited resolved-case base and a low allowance rate in the reported docket, while the interview figure identifies a materially relevant prosecution event for applicants developing response strategies.

The listed companies are Ngk Insulators Ltd., Kohler Co., and ZOBELE HOLDING S.P.A. The leading firms are Muncy, Geissler, Olds & Lowe, P.C., Bainwood, Huang & Associates, LLC, and DLA Piper LLP (US) Boston. Practitioners handling matters in this assignment should consider focused claim amendments and deliberate interview preparation, particularly where preserving commercially important claim features requires iterative prosecution.

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

Performance Statistics

15.6%
Allow Rate
-54.4% vs TC avg
141
Total Applications
+25.2%
Interview Lift
1279
Avg Prosecution Days
Based on 122 resolved cases, 2023–2026

Rejection Statute Breakdown

0.2%
§101 Eligibility
22.6%
§102 Novelty
51.9%
§103 Obviousness
22.4%
§112 Clarity

Currently Pending Office Actions

App #TitleStatusAssignee
18846659 A METHOD FOR MANUFACTURE OF HYBRID METAL ALLOY CASTINGS Non-Final OA Individual inventor
18696231 DEVICES, SYSTEMS, AND METHODS FOR APPLICATION OF FIRE RETARDANT Final Rejection Individual inventor
18927092 PRESSURIZED SHOWERHEAD HAVING AN ARRAY OF DIGITALLY CONTROLLED VALVES Non-Final OA KOHLER CO.
18581539 HONEYCOMB STRUCTURE FOR HEAT EXCHANGER AND HEAT EXCHANGER Non-Final OA NGK INSULATORS, LTD.
18407526 HEAT EXCHANGER Final Rejection NGK INSULATORS, LTD.
18719288 DEVICE FOR EVAPORATING VOLATILE SUBSTANCES Non-Final OA Zobele Holding, S.p.A
18838976 METHOD AND APPARATUS FOR IMPROVING ALUMINUM DEGASSING EFFICIENCY Non-Final OA PYROTEK, INC.
18846618 DISPENSING DEVICE FOR INTERMITTENTLY DISPENSING A COOLING MEDIUM ONTO A CAST STRAND Non-Final OA Primetals Technologies Austria GmbH
18290978 SELF-DEFROSTING HEAT EXCHANGER AND METHOD OF USING SAME Non-Final OA Vladimir Vladimirovich FEDOROV
18685507 Air cooled heat exchanger Final Rejection DHES B.V.
18579700 CEILING ELEMENT WITH AIR OUTLET BOX Final Rejection ZEHNDER GROUP INTERNATIONAL AG
18230121 PLANTING SYSTEM HAVING AGITATOR Non-Final OA VENTUREONE - SOLE PROPRIETORSHIP L.L.C.
18025787 APPARATUS AND METHOD FOR THERMAL FOUNDATION ELEMENTS Final Rejection CAPTURE TECHNOLOGIES CORPORATION

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Frequently Asked Questions

What is examiner Len Tran's allowance rate?

15.6% of resolved applications examined by Len Tran were allowed (122 resolved cases), compared with 0.0% across Art Unit 3744 over the last five years.

Does an interview help with examiner Len Tran?

This examiner's interview lift is +25.2 percentage points: the difference in allowance rate between resolved applications that had an examiner interview and those that did not.

How long does examiner Len Tran take to allow a patent?

Applications allowed by Len Tran took 1,279 days on average from filing to allowance.

Which art unit does examiner Len Tran work in?

Len Tran examines applications in Art Unit 3744 in Tech Center 3700 (Medical Devices & Mechanical Engineering).

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