#1Ben Hsiao-Pang Liu
Serves this area from Hayward, CA (3 mi)
Patent Attorneys & Agents in Castro Valley, CA
The top-ranked patent attorneys and agents serving Castro Valley, CA are Ben Hsiao-Pang Liu, Michael J. Smith and Azariah D Cole-Shephard. We list 4635 patent attorneys and agents serving Castro Valley, CA. 30 of the providers shown match an active record from U.S. Patent and Trademark Office, checked on the date shown. Rankings follow our published methodology; sponsored placements never change rank.
Patent Attorneys & Agents serving Castro Valley, CA (Alameda County). 4635 providers, 10 of the top 10 verified against federal or state records. Registry records checked on 2026-11-04.
Top 10 ranked patent attorneys and agents for Castro Valley
#2Michael J. Smith
Serves this area from Hayward, CA (3 mi)#3Azariah D Cole-Shephard
Serves this area from CA#4Jie Yang
Serves this area from CA#5Kathleen L. Peek
Serves this area from CA#6Michael S. Tam
Serves this area from CA#7Peter T Liu
Serves this area from CA#8Qing Xia
Serves this area from CA#9Catherine May Sanders
Serves this area from CA#10DeeAnn Dugan (DeeAnn Dugan, Attorney at Law)
Serves this area from CA
20 more providers serving this area
- Jayanti Muliyil, CA
- Kennedy Koblin, CA
- Matthew R Kaser, CA
- Jen-Yiu Kevin Liao, Ashland, CA (3 mi)
- Kevin Le, Ashland, CA (3 mi)
- Justas Geringson, Hayward, CA (4 mi)
- Xin Gao, Hayward, CA (4 mi)
- Huong T Nguyen (Impax Laboratories Inc), Hayward, CA (5 mi)
- Margaret M Snowden (Impax Laboratories, Inc.), Hayward, CA (5 mi)
- Alan D. Borelli, San Leandro, CA (6 mi)
- Andrea Y Amey, San Ramon, CA (6 mi)
- A Stephen Zavell (Chevron U.S.A. Inc.), San Ramon, CA (6 mi)
- Bernard F Rose (Squire Patton Boggs (US) LLP), San Ramon, CA (6 mi)
- Bishwarup Mondal, San Ramon, CA (6 mi)
- Cindy I Abravanel, San Ramon, CA (6 mi)
- Douglas Allan Petry, San Ramon, CA (6 mi)
- Elizabeth A Doherty (McNeill Baur PLLC), San Ramon, CA (6 mi)
- Furqan A Nanji (Furqan Nanji), San Leandro, CA (6 mi)
- Greg S Hollrigel (Cooper Companies), San Ramon, CA (6 mi)
- Jhujhaar Singh, San Leandro, CA (6 mi)
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Frequently asked questions
How many patent attorneys and agents serve Castro Valley?
We list 4635 patent attorneys and agents serving Castro Valley, CA: 0 based there and 4635 serving it from nearby. 10 of the top 10 match an active federal or state record, checked on 2026-11-04.
Which patent attorneys and agents serve Castro Valley?
The top-ranked patent attorneys and agents serving Castro Valley, CA are Ben Hsiao-Pang Liu, Michael J. Smith, Azariah D Cole-Shephard, Jie Yang and Kathleen L. Peek. The full ranked list, with the official records each provider matched, is on this page.
Which patent attorneys and agents serving Castro Valley are verified against official records?
10 of the top 10 match an active official record: Ben Hsiao-Pang Liu (U.S. Patent and Trademark Office), Michael J. Smith (U.S. Patent and Trademark Office), Azariah D Cole-Shephard (U.S. Patent and Trademark Office), Jie Yang (U.S. Patent and Trademark Office) and Kathleen L. Peek (U.S. Patent and Trademark Office), and 5 more on this page. Each badge links to the official record it matched.
How are these companies ranked?
By our published methodology: verified registrations, documented capabilities, years registered and responsiveness. Sponsored placements are shown separately and never affect rank.
What does "Verified" mean on this page?
"Verified" means we matched the provider to an active official record on the date shown; each badge links to that record. The absence of a badge only means we have not verified that item.
What is the difference between a patent attorney and a patent agent?
Both are registered with the USPTO to prepare and prosecute patent applications. Patent attorneys are also licensed lawyers and can handle litigation and other legal matters; agents cannot.
"Verified" means we matched the provider to an active official record on the date shown. The absence of a badge only means we have not verified that item. How we rank and verify. Page updated .