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Ontario, California

Patent attorneys in Ontario

Ontario, California is home to 4 USPTO-registered patent practitioners. Working with a local practitioner can streamline in-person meetings for invention disclosures, signing inventor declarations, and reviewing prior-art search results — but every USPTO practitioner is licensed to practice nationally, so a non-local choice is also valid. Local firms with the most USPTO-registered practitioners include Mag Instrument, Inc. and Intellectual Property Venture Group.

Elizabeth Agcaoili Campos

Reg. 50662
Patent attorney

Ontario, CA · 91762

858-255-1622

Maria-Emily R. Gapuzan

Reg. 63026
Patent agent

Ontario, CA · 91764

909-988-5159

Jerrold Brendan Reilly

Reg. 32293
Patent attorney

Mag Instrument, Inc.

Ontario, CA · 917661

909-947-1006

Raymond E Roberts

Reg. 38597
Patent attorney

Intellectual Property Venture Group

Ontario, CA · 91764-5556

909-962-7010

Common questions

Do patent attorneys in Ontario cost more than the national average?
Patent attorney fees vary primarily by experience and complexity of the invention, not by city. A typical provisional patent application in the US runs $1,500 to $5,000; a non-provisional utility filing runs $5,000 to $15,000. Hourly rates in Ontario tend to track the broader California legal market.
How many USPTO practitioners list a Ontario office?
4 USPTO-registered patent practitioners list a Ontario mailing address on the OEDCI roster. You can sort by firm size and contact each directly using the phone numbers shown.
Can I work with a Ontario practitioner remotely?
Yes. All filings happen through USPTO's electronic Patent Center — no in-person presence is required. A Ontario-based practitioner is convenient for local inventor signings and in-person meetings but not a requirement for representation.
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