Prosecution Insights
Last updated: October 26, 2026

Christina A Riddle, USPTO Patent Examiner

Listed by the USPTO as RIDDLE, CHRISTINA A

Tech Center 3600 • Art Units: 1724 1754 2851 2882 3652

This examiner grants 81% of resolved cases

Analysis

RIDDLE, CHRISTINA A is a USPTO patent examiner in tech center 3600 and art unit 1724. The profile records 940 resolved cases, an allowance rate of 81.0%, and a median of 1071 days to allowance. The large case record supports a substantial assessment of prosecution outcomes. The allowance rate indicates that most recorded matters reached allowance, while the median interval shows that favorable outcomes still require sustained prosecution effort.

The interview lift is 14.0%, suggesting that interviews have a meaningful but limited relationship to allowance outcomes in this record. ASML Holding N.V., Carl Zeiss SMT GmbH, and Gigaphoton Inc. are the listed leading companies. Studebaker Brackett PLLC, Pillsbury Winthrop Shaw Pittman, LLP, and CARTER, DELUCA & FARRELL LLP are the listed leading firms. Practitioners can combine disciplined written prosecution with selective interviews and plan around the 1071-day median.

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

Performance Statistics

81.0%
Allow Rate
+29.0% vs TC avg
995
Total Applications
+14.0%
Interview Lift
1071
Avg Prosecution Days
Based on 940 resolved cases, 2023–2026

Rejection Statute Breakdown

2.7%
§101 Eligibility
21.1%
§102 Novelty
47.5%
§103 Obviousness
18.9%
§112 Clarity

Currently Pending Office Actions

App #TitleStatusAssignee
19056497 MEASURING METHOD, MEASURING APPARATUS, LITHOGRAPHY APPARATUS, AND ARTICLE MANUFACTURING METHOD Non-Final OA CANON KABUSHIKI KAISHA
19005395 VIBRATION CONTROL OF STRUCTURAL ELEMENTS OF EXPOSURE APPARATUS Non-Final OA Nikon Corporation
18933209 SYSTEMS AND METHODS FOR MONITORING SPATIAL LIGHT MODULATOR (SLM) FLARE Final Rejection NIKON CORPORATION
18353300 SUBSTRATE PROCESSING APPARATUS, SUBSTRATE PROCESSING METHOD, AND RECORDING MEDIUM Final Rejection Tokyo Electron Limited
18397265 CONSTRUCTING A SUBSTRATE TOPOLOGY MAP BASED ON MEASURED PROPERTIES Non-Final OA APPLIED MATERIALS, INC.
19032570 SYSTEM AND METHOD FOR DYNAMICALLY CONTROLLING TEMPERATURE OF THERMOSTATIC RETICLES Final Rejection Taiwan Semiconductor Manufacturing Company, Ltd.
18878055 REPLICATION METHOD WITH A CONTACT BODY Non-Final OA Carl Zeiss Jena GmbH
18376237 APPARATUS AND METHOD FOR DETERMINING A CONDITION ASSOCIATED WITH A PELLICLE Final Rejection ASML HOLDING N.V
19123378 OPTICAL SYSTEM FOR METROLOGY Non-Final OA ASML NETHERLANDS B.V.
19121669 POSITION MEASUREMENT SYSTEM AND LITHOGRAPHIC APPARATUS Non-Final OA ASML Netherlands B.V.
19121106 METHOD AND APPARATUS FOR INSPECTION FOCUS MEASUREMENT Non-Final OA ASML NETHERLANDS B.V.
18875601 A PATTERNING DEVICE VOLTAGE BIASING SYSTEM FOR USE IN EUV LITHOGRAPHY Final Rejection ASML Netherlands B.V.
18868802 SENSOR MODULE, ILLUMINATOR, METROLOGY DEVICE AND ASSOCIATED METROLOGY METHOD Final Rejection ASML Netherlands B.V.
18869149 A RADIATION SOURCE Final Rejection ASML Netherlands B.V.
18726728 A PELLICLE CLEANING SYSTEM Final Rejection ASML NETHERLANDS B.V.
18251261 CONDITIONING APPARATUS AND METHOD Final Rejection ASML Netherlands B.V.

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Frequently Asked Questions

What is examiner Christina A Riddle's allowance rate?

81.0% of resolved applications examined by Christina A Riddle were allowed (940 resolved cases), compared with 63.2% across Art Unit 1724 over the last five years.

Does an interview help with examiner Christina A Riddle?

This examiner's interview lift is +14.0 percentage points: the difference in allowance rate between resolved applications that had an examiner interview and those that did not.

How long does examiner Christina A Riddle take to allow a patent?

Applications allowed by Christina A Riddle took 1,071 days on average from filing to allowance.

Which art unit does examiner Christina A Riddle work in?

Christina A Riddle examines applications in Art Unit 1724 in Tech Center 3600 (Transportation, E-Commerce & Mechanical Systems).

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