Prosecution Insights
Last updated: October 26, 2026

Chu Chuan Liu, USPTO Patent Examiner

Listed by the USPTO as LIU, CHU CHUAN

Tech Center 3700 • Art Units: 1796 1797 3735 3774 3777 3791

This examiner grants 71% of resolved cases

Analysis

Chu Chuan Liu is an examiner in Tech Center 3700 and Art Unit 1796. The examiner has 791 resolved cases. The data shows an allowance rate of 71.3 percent for these matters. This volume of cases provides a baseline for evaluating prosecution outcomes in this specific administrative unit.

The interview lift for this examiner is 14.9 percent. This figure is lower than the 71.3 percent allowance rate. The median days to allowance is 1227. This timeline reflects the duration from filing to a successful outcome for the 791 resolved cases. The 1227 days to allowance represents the typical timeframe for reaching a grant in this art unit.

The examiner frequently interacts with major entities such as MASIMO Corporation, Apollon Inc., and ViOptix Inc. Legal representation in these matters often involves firms like Knobbe, Martens, Olson & Bear, LLP, United One Law Group LLC, and FASKEN MARTINEAU DUMOULIN, LLP (Montreal). These participants represent the primary corporate and legal environment for the examiner's work in Tech Center 3700.

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

Performance Statistics

71.3%
Allow Rate
+1.3% vs TC avg
828
Total Applications
+14.9%
Interview Lift
1227
Avg Prosecution Days
Based on 791 resolved cases, 2023–2026

Rejection Statute Breakdown

10.7%
§101 Eligibility
14.1%
§102 Novelty
36.9%
§103 Obviousness
26.6%
§112 Clarity

Currently Pending Office Actions

App #TitleStatusAssignee
19390607 RING-TYPE WEARABLE DEVICE Non-Final OA SAMSUNG ELECTRONICS CO., LTD.
18921688 AUTOREGULATION SYSTEM AND METHOD USING TISSUE OXIMETRY AND BLOOD PRESSURE Non-Final OA Becton, Dickinson and Company

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Frequently Asked Questions

What is examiner Chu Chuan Liu's allowance rate?

71.3% of resolved applications examined by Chu Chuan Liu were allowed (791 resolved cases), compared with 55.6% across Art Unit 1796 over the last five years.

Does an interview help with examiner Chu Chuan Liu?

This examiner's interview lift is +14.9 percentage points: the difference in allowance rate between resolved applications that had an examiner interview and those that did not.

How long does examiner Chu Chuan Liu take to allow a patent?

Applications allowed by Chu Chuan Liu took 1,227 days on average from filing to allowance.

Which art unit does examiner Chu Chuan Liu work in?

Chu Chuan Liu examines applications in Art Unit 1796 in Tech Center 3700 (Medical Devices & Mechanical Engineering).

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