Prosecution Insights
Last updated: October 26, 2026

Lessanework T Seifu, USPTO Patent Examiner

Listed by the USPTO as SEIFU, LESSANEWORK T

Tech Center 3700 • Art Units: 1637 1692 1731 1732 1736 1774 1797 3753

This examiner grants 79% of resolved cases

Analysis

SEIFU, LESSANEWORK T handles cases in Tech Center 3700 and art unit 1637. The profile shows 1076 resolved cases, a 79.2% allowance rate, and a 1.3% interview lift. The median days to allowance is 847, providing a shorter observed timeline than the other prosecution metrics alone might suggest.

The company list includes LG Chem Ltd., Microjet Technology Co., Ltd., and Samsung Electronics Co., Ltd. The listed firms are BIRCH STEWART KOLASCH & BIRCH, LLP, MCDONNELL BOEHNEN HULBERT & BERGHOFF LLP, and WENDEROTH, LIND & PONACK L.L.P. The limited interview lift makes precise written responses and well-supported amendments especially important.

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

Performance Statistics

79.2%
Allow Rate
+9.2% vs TC avg
1,119
Total Applications
+1.3%
Interview Lift
847
Avg Prosecution Days
Based on 1076 resolved cases, 2023–2026

Rejection Statute Breakdown

0.9%
§101 Eligibility
26.0%
§102 Novelty
37.4%
§103 Obviousness
29.9%
§112 Clarity

Currently Pending Office Actions

App #TitleStatusAssignee
18511012 SCRUBBER SYSTEM Non-Final OA SAMSUNG ELECTRONICS CO., LTD.
18754539 AROMA GENERATOR Non-Final OA SONY GROUP CORPORATION
18049085 METHOD AND APPARATUS FOR PREPARATION OF ALKYLENE CARBONATE USING POLYAMINE-HETEROGENEOUS CATALYST Final Rejection KOREA INSTITUTE OF SCIENCE AND TECHNOLOGY
18301257 FOOD PROCESSING APPARATUS Non-Final OA Panasonic Intellectual Property Management Co., Ltd.
18384064 ELECTROSYNTHESIS SYSTEM Non-Final OA HONDA MOTOR CO., LTD.
17773770 AMMONIA DERIVATIVE PRODUCTION PLANT AND AMMONIA DERIVATIVE PRODUCTION METHOD Final Rejection MITSUBISHI HEAVY INDUSTRIES, LTD.
18162429 INITIATOR PARTICLE FOR DNA SYNTHESIS Non-Final OA Lenovo (Singapore) Pte. Ltd.
18287080 Electrical Heaters For Exhaust Aftertreatment Systems and Assemblies Non-Final OA CORNING INCORPORATED
18289776 Polymerization Reaction Device for High Viscosity Resin Non-Final OA LG Chem, Ltd.
17627952 Precursor for Positive Electrode Active Material, Manufacturing Method Thereof, And Manufacturing Apparatus Thereof Final Rejection LG Chem, Ltd.
18386700 OLEFIN POLYMERIZATION REACTOR Non-Final OA Sumitomo Chemical Company, Limited
18456053 PROCESSES AND APPARATUSES FOR HEATING A PROCESS FLUID Non-Final OA UOP LLC
18566941 A CATALYTIC REACTOR AND A METHOD FOR PROVIDING A CATALYTIC REACTION Non-Final OA Catator AB

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Frequently Asked Questions

What is examiner Lessanework T Seifu's allowance rate?

79.2% of resolved applications examined by Lessanework T Seifu were allowed (1,076 resolved cases), compared with 45.4% across Art Unit 1637 over the last five years.

Does an interview help with examiner Lessanework T Seifu?

This examiner's interview lift is +1.3 percentage points: the difference in allowance rate between resolved applications that had an examiner interview and those that did not.

How long does examiner Lessanework T Seifu take to allow a patent?

Applications allowed by Lessanework T Seifu took 847 days on average from filing to allowance.

Which art unit does examiner Lessanework T Seifu work in?

Lessanework T Seifu examines applications in Art Unit 1637 in Tech Center 3700 (Medical Devices & Mechanical Engineering).

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