Prosecution Insights
Last updated: October 27, 2026

Robert Canfield, USPTO Patent Examiner

Listed by the USPTO as CANFIELD, ROBERT

Tech Center 3600 • Art Units: 3635 3636

This examiner grants 76% of resolved cases

Analysis

CANFIELD, ROBERT works in tech center 3600 and art unit 3635. The profile records 1166 resolved cases, a 76.0% allowance rate, and an 18.0% interview lift. The median days to allowance are 750.

The listed companies are Everstream Solutions LLC, Wonderland Switzerland AG, and Electroelsa Srl. The listed firms are BLANK ROME LLP, BOND, SCHOENECK & KING, PLLC, and Budzyn IP Law, LLC. The substantial case volume and favorable allowance rate provide a useful foundation for prosecution planning. The interview lift is also positive, so interviews may be a practical tool when written exchanges leave claim issues unresolved.

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

Performance Statistics

76.0%
Allow Rate
+24.0% vs TC avg
1,197
Total Applications
+18.0%
Interview Lift
750
Avg Prosecution Days
Based on 1166 resolved cases, 2023–2026

Rejection Statute Breakdown

1.2%
§101 Eligibility
28.2%
§102 Novelty
28.9%
§103 Obviousness
34.1%
§112 Clarity

Currently Pending Office Actions

App #TitleStatusAssignee
19038590 CANOPY ADJUSTMENT MECHANISM AND BABY CARRIER Non-Final OA WONDERLAND SWITZERLAND AG
18797637 COLLAPSIBLE CANOPY WITH REINFORCEMENT BARS Final Rejection Individual inventor

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Frequently Asked Questions

What is examiner Robert Canfield's allowance rate?

76.0% of resolved applications examined by Robert Canfield were allowed (1,166 resolved cases), compared with 58.9% across Art Unit 3635 over the last five years.

Does an interview help with examiner Robert Canfield?

This examiner's interview lift is +18.0 percentage points: the difference in allowance rate between resolved applications that had an examiner interview and those that did not.

How long does examiner Robert Canfield take to allow a patent?

Applications allowed by Robert Canfield took 750 days on average from filing to allowance.

Which art unit does examiner Robert Canfield work in?

Robert Canfield examines applications in Art Unit 3635 in Tech Center 3600 (Transportation, E-Commerce & Mechanical Systems).

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