Prosecution Insights
Last updated: October 27, 2026

Chris H Chu, USPTO Patent Examiner

Listed by the USPTO as CHU, CHRIS H

Tech Center 2800 • Art Units: 2874

This examiner grants 53% of resolved cases

Analysis

CHU, CHRIS H has resolved 671 cases in Tech Center 2800 and Art Unit 2874. The allowance rate is 53.1%, and the median time to allowance is 1124 days. The outcome record is nearly divided between allowance and non-allowance, while the median timeline indicates that prosecution commonly requires sustained attention.

The interview lift is 8.6%, showing a limited measured association with allowance in this record. The principal companies are Corning Incorporated, Taiwan Semiconductor Manufacturing Company, Ltd., and Sumitomo Electric Industries Ltd. The principal firms are Kilpatrick Townsend & Stockton LLP - West Coast, Laine IP Oy, and McDonald Hopkins LLC. Written claim development and early identification of distinguishing features may deserve priority over relying on interviews alone.

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

Performance Statistics

53.1%
Allow Rate
-14.9% vs TC avg
722
Total Applications
+8.6%
Interview Lift
1124
Avg Prosecution Days
Based on 671 resolved cases, 2023–2026

Rejection Statute Breakdown

0.5%
§101 Eligibility
20.7%
§102 Novelty
74.6%
§103 Obviousness
1.6%
§112 Clarity

Currently Pending Office Actions

App #TitleStatusAssignee
16714100 OPTICAL GLASS, AND OPTICAL ELEMENT, OPTICAL SYSTEM, CEMENTED LENS, INTERCHANGEABLE CAMERA LENS, AND OPTICAL DEVICE USING SAME Final Rejection NIKON CORPORATION
18861376 Hollow Core Optical Waveguiding Enabled by Zero-Index Materials Non-Final OA The Regents of the University of California
18755868 RESIN COMPOSITION FOR COLORED COATING ON OPTICAL FIBER, OPTICAL FIBER, AND OPTICAL FIBER RIBBON Non-Final OA SUMITOMO ELECTRIC INDUSTRIES, LTD.
18662275 THREE-LAYER THIN-COATED FIBER HAVING IMPROVED DAMAGE RESISTANCE Final Rejection CORNING INCORPORATED
18212315 FEW MODE OPTICAL FIBERS WITH REDUCED MODE COUPLING AND LOW BIREFRINGENCE Final Rejection CORNING INCORPORATED
18211696 CO-ALKALI DOPED OPTICAL FIBERS Final Rejection CORNING INCORPORATED
18784168 FIBER OPTIC NETWORK RACK SYSTEM WITH VERTICALLY MOVABLE RACK ASSEMBLIES Non-Final OA CORNING RESEARCH & DEVELOPMENT CORPORATION
18515679 OPTICAL FIBER CABLE HAVING LOW FREE SPACE AND HIGH FIBER DENSITY Final Rejection CORNING RESEARCH & DEVELOPMENT CORPORATION
18381438 CONNECTOR FOR ALIGNMENT OF INTEGRATED WAVEGUIDES AND OPTICAL FIBERS Non-Final OA CORNING RESEARCH & DEVELOPMENT CORPORATION
18244473 FIBER OPTIC CABLE ASSEMBLY WITH IN-LINE DISTRIBUTION HOUSINGS AND METHOD OF MAKING AND USING SAME Non-Final OA CORNING RESEARCH & DEVELOPMENT CORPORATION
18229936 ANNEALED SUBUNITS IN BUNDLED DROP ASSEMBLY AND PROCESS OF ANNEALING SUBUNITS IN BUNDLED DROP ASSEMBLY Final Rejection CORNING RESEARCH & DEVELOPMENT CORPORATION
18206268 MULTICORE OPTICAL FIBER SYSTEM CONNECTIVITY IN DATA CENTERS Non-Final OA CORNING RESEARCH & DEVELOPMENT CORPORATION
17974683 ATTACHMENT BODIES AND OPTICAL CABLE ASSEMBLIES FOR MATING WITH COMPACT MULTIPORTS Final Rejection Corning Research & Development Corporation
17368398 SINGLE-MODE OPTICAL FIBER WITH THIN COATING FOR HIGH DENSITY CABLES AND INTERCONNECTS Final Rejection CORNING RESEARCH & DEVELOPMENT CORPORATION
18754329 Passive On-Chip Optical Long-Pass Filter Non-Final OA The Hong Kong University of Science and Technology
17519411 Integrated Optical Switch Having Doped Fiber/Waveguide Amplifiers Packaged in A Transposer Non-Final OA Mellanox Technologies, Ltd.
18791384 METHOD FOR FABRICATING EMBEDDED SILICON PHOTONICS CHIP IN A MULTI-DIE PACKAGE Non-Final OA Taiwan Semiconductor Manufacturing Company, Ltd.
18446424 EMBEDDED SILICON PHOTONICS CHIP IN A MULTI-DIE PACKAGE Non-Final OA Taiwan Semiconductor Manufacturing Company, Ltd.
17697822 EMBEDDED SILICON PHOTONICS CHIP IN A MULTI-DIE PACKAGE Final Rejection Taiwan Semiconductor Manufacturing Company, Ltd.
18319854 Optical Devices and Methods of Manufacture Non-Final OA Taiwan Semiconductor Manufacturing Co., Ltd.
18908946 Electro-optical device via arrangement Non-Final OA Teknologian tutkimuskeskus VTT Oy
18714602 Photonic integrated circuits Final Rejection Teknologian tutkimuskeskus VTT Oy
18501602 PHOTODETECTORS WITH A NOTCHED LIGHT-ABSORBING LAYER Non-Final OA GlobalFoundries U.S. Inc.

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Frequently Asked Questions

What is examiner Chris H Chu's allowance rate?

53.1% of resolved applications examined by Chris H Chu were allowed (671 resolved cases), compared with 78.9% across Art Unit 2874 over the last five years.

Does an interview help with examiner Chris H Chu?

This examiner's interview lift is +8.6 percentage points: the difference in allowance rate between resolved applications that had an examiner interview and those that did not.

How long does examiner Chris H Chu take to allow a patent?

Applications allowed by Chris H Chu took 1,124 days on average from filing to allowance.

Which art unit does examiner Chris H Chu work in?

Chris H Chu examines applications in Art Unit 2874 in Tech Center 2800 (Semiconductors, Circuits & Optics).

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