Patent Attorneys & Agents Directory

Patent Attorneys & Agents in St. Clair County, IL

The top-ranked patent attorneys and agents serving St. Clair County, IL are Ernest J Hanson (Brown & James, P.C.), Katelyn E. Crockett and Marlene K Astor. We list 441 patent attorneys and agents serving St. Clair County, IL. 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 St. Clair County, IL. 441 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 St. Clair County

Ranked by our published methodology. Sponsored providers are shown separately.
#ProviderVerified recordsBased inPhone
1Ernest J Hanson (Brown & James, P.C.)✓ Registered to practice before the USPTO in patent matters #62955
IL(618) 235-5590
2Katelyn E. Crockett✓ Registered to practice before the USPTO in patent matters #84546
IL(618) 402-6344
3Marlene K Astor✓ Registered to practice before the USPTO in patent matters #46005
IL(571) 274-1363
4Natalie B. Cohn✓ Registered to practice before the USPTO in patent matters #85159
IL(618) 567-7169
5Ned William Randle✓ Registered to practice before the USPTO in patent matters #35989
IL(618) 473-2030
6Tearra J. Vaughn✓ Registered to practice before the USPTO in patent matters #71211
Fairview Heights, IL(314) 246-0177
7Thaddeus W. Juilfs✓ Registered to practice before the USPTO in patent matters #82550
O'Fallon, IL(618) 239-3600
8Wendell R Guffey✓ Registered to practice before the USPTO in patent matters #31762
Swansea, IL(618) 207-9596
9Paul M Schimpf (Stumpf & Gutknecht, P.C.)✓ Registered to practice before the USPTO in patent matters #47060
IL(618) 281-7626
10Don W Weber✓ Registered to practice before the USPTO in patent matters #32321
IL(618) 973-5143
20 more providers serving this area

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Frequently asked questions

How many patent attorneys and agents serve St. Clair County?

We list 441 patent attorneys and agents serving St. Clair County, IL: 8 based there and 433 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 St. Clair County?

The top-ranked patent attorneys and agents serving St. Clair County, IL are Ernest J Hanson (Brown & James, P.C.), Katelyn E. Crockett, Marlene K Astor, Natalie B. Cohn and Ned William Randle. The full ranked list, with the official records each provider matched, is on this page.

Which patent attorneys and agents serving St. Clair County are verified against official records?

10 of the top 10 match an active official record: Ernest J Hanson (Brown & James, P.C.) (U.S. Patent and Trademark Office), Katelyn E. Crockett (U.S. Patent and Trademark Office), Marlene K Astor (U.S. Patent and Trademark Office), Natalie B. Cohn (U.S. Patent and Trademark Office) and Ned William Randle (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 .

Communities served

Belleville, O'Fallon, East St. Louis, Cahokia Heights, Fairview Heights, Shiloh, Swansea, Mascoutah, Lebanon, Freeburg, Caseyville, Millstadt, Smithton, Dupo, Washington Park, Fairmont City, New Athens, Marissa, Brooklyn, St. Libory, Lenzburg, East Carondelet, Summerfield, Fayetteville, Sauget, Darmstadt, Floraville, Rentchler, Paderborn

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