#1Maria-Emily R. Gapuzan
Serves this area from Ontario, CA (3 mi)
Patent Attorneys & Agents in Ontario, CA
The top-ranked patent attorneys and agents serving Ontario, CA are Maria-Emily R. Gapuzan, Raymond E Roberts (Intellectual Property Venture Group) and Elizabeth Agcaoili Campos. We list 2774 patent attorneys and agents serving Ontario, 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 Ontario, CA (San Bernardino County). 2774 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 Ontario
#2Raymond E Roberts (Intellectual Property Venture Group)
Serves this area from Ontario, CA (3 mi)#3Elizabeth Agcaoili Campos
Serves this area from Ontario, CA (4 mi)#4Eric Gani
Serves this area from Rancho Cucamonga, CA (5 mi)#5Gregory Donald Carson (Carson Patents)
Serves this area from Rancho Cucamonga, CA (5 mi)#6Joe Allen Brock II (Patent Venture Group)
Serves this area from Rancho Cucamonga, CA (5 mi)#7Alan Chang
Serves this area from Chino, CA (5 mi)#8Kevin Yang
Serves this area from Jurupa Valley, CA (5 mi)#9Anthony G Smyth (Loza & Loza, LLP)
Serves this area from Upland, CA (6 mi)#10Christina S Loza (Loza & Loza, LLP)
Serves this area from Upland, CA (6 mi)
20 more providers serving this area
- Daniel Rene Kimbell (Loza & Loza), Upland, CA (6 mi)
- David S Sarisky (LOZA & LOZA, LLP), Upland, CA (6 mi)
- Derek W Yeung (LOZA & LOZA, LLP), Upland, CA (6 mi)
- Eric J Nuss (Loza & Loza, LLP), Upland, CA (6 mi)
- Eugene R. Worley (LOZA & LOZA, LLP), Upland, CA (6 mi)
- Gabriel Fitch (Loza & Loza, LLP), Upland, CA (6 mi)
- George G C Tseng (Loza & Loza, LLP), Upland, CA (6 mi)
- George L Fountain (LOZA & LOZA, LLP), Upland, CA (6 mi)
- Gordon Reinhold Lindeen III (Loza & Loza, LLP), Upland, CA (6 mi)
- Heidi Leigh Eisenhut (Loza & Loza, LLP), Upland, CA (6 mi)
- Holly Lynn Rudnick (Loza & Loza, LLP), Upland, CA (6 mi)
- Jeffrey N Katz, Upland, CA (6 mi)
- Jessica W Smith (Loza & Loza, LLP), Upland, CA (6 mi)
- John Kahn Park (Loza & Loza, LLP), Upland, CA (6 mi)
- Julio Loza (Loza & Loza, LLP), Upland, CA (6 mi)
- Jun S Ha (Loza & Loza LLP), Upland, CA (6 mi)
- Kari A. Dickinson (Loza & Loza, LLP), Upland, CA (6 mi)
- Kevin L Soules (Loza & Loza LLP), Upland, CA (6 mi)
- Lew Edward V Macapagal (Loza & Loza, LLP), Upland, CA (6 mi)
- Michael F Fedrick (Loza & Loza, LLP), Upland, CA (6 mi)
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Frequently asked questions
How many patent attorneys and agents serve Ontario?
We list 2774 patent attorneys and agents serving Ontario, CA: 0 based there and 2774 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 Ontario?
The top-ranked patent attorneys and agents serving Ontario, CA are Maria-Emily R. Gapuzan, Raymond E Roberts (Intellectual Property Venture Group), Elizabeth Agcaoili Campos, Eric Gani and Gregory Donald Carson (Carson Patents). The full ranked list, with the official records each provider matched, is on this page.
Which patent attorneys and agents serving Ontario are verified against official records?
10 of the top 10 match an active official record: Maria-Emily R. Gapuzan (U.S. Patent and Trademark Office), Raymond E Roberts (Intellectual Property Venture Group) (U.S. Patent and Trademark Office), Elizabeth Agcaoili Campos (U.S. Patent and Trademark Office), Eric Gani (U.S. Patent and Trademark Office) and Gregory Donald Carson (Carson Patents) (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 .