#1Alan L Cassel
Based in St. Peters, MO
Patent Attorneys & Agents in St. Charles County, MO
The top-ranked patent attorneys and agents serving St. Charles County, MO are Alan L Cassel, Bruce T Atkins (Bruce T. Atkins Intellectual Property) and Joseph M. Ellsworth. We list 321 patent attorneys and agents serving St. Charles County, MO. 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. Charles County, MO. 321 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. Charles County
#2Bruce T Atkins (Bruce T. Atkins Intellectual Property)
Based in MO#3Joseph M. Ellsworth
Based in MO#4Lloyd G Buchanan
Based in Weldon Spring Heights, MO#5Martha Ann Michaels (Law Office of Martha A. Michaels)
Based in St. Paul, MO#6Michelle J Smith (Law Offices of Michelle Smith)
Based in St. Peters, MO#7Paul D Markowitz (SunEdison Semiconductor LLC)
Based in St. Peters, MO#8Peter T Rasche (Synergetics, Inc.)
Based in O'Fallon, MO#9Prema S. Karunanithi
Based in MO#10Raymond J. Whitehill II (Pontello, Bressler, Norwood, and Associates)
Based in MO
20 more providers serving this area
- Raymond W Deppen, O'Fallon, MO
- Sandeep Kumar, MO
- Steven D Heinrich, MO
- Timothy B McBride (Mastercard International Incorporated), O'Fallon, MO
- Benton J Bradshaw, Wildwood, MO (10 mi)
- Clayton T Larue, Wildwood, MO (10 mi)
- David J. Lanzotti, Wildwood, MO (10 mi)
- Earl R Schultz (Schultz and Associates LLP), Wildwood, MO (10 mi)
- James B Surber, Wildwood, MO (10 mi)
- Mark F Wachter (Mark F. Wachter, Esq.), Wildwood, MO (10 mi)
- Michael David Petzoldt (TransTek INC), Wildwood, MO (10 mi)
- Scott A Smith (Katalyst Surgical, LLC), Wildwood, MO (10 mi)
- Srinivasan R. Nagarajan, Wildwood, MO (10 mi)
- Ronald James Miller (Ronald J. Miller, Attorney At Law), Chesterfield, MO (10 mi)
- Verne A Luckow (The Intellectual Property Law Office of Verne A. Luckow, LLC), Chesterfield, MO (10 mi)
- Amanda J Carmany-Rampey (Monsanto Company), Chesterfield, MO (11 mi)
- Andrea P Denklau, Chesterfield, MO (11 mi)
- Charles Carroll McCloskey IV (Charles C. McCloskey, LLC), Chesterfield, MO (11 mi)
- Colleen N. Gray (Bunge), Chesterfield, MO (11 mi)
- David H Chervitz, Chesterfield, MO (11 mi)
Request quotes
Frequently asked questions
How many patent attorneys and agents serve St. Charles County?
We list 321 patent attorneys and agents serving St. Charles County, MO: 14 based there and 307 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. Charles County?
The top-ranked patent attorneys and agents serving St. Charles County, MO are Alan L Cassel, Bruce T Atkins (Bruce T. Atkins Intellectual Property), Joseph M. Ellsworth, Lloyd G Buchanan and Martha Ann Michaels (Law Office of Martha A. Michaels). The full ranked list, with the official records each provider matched, is on this page.
Which patent attorneys and agents serving St. Charles County are verified against official records?
10 of the top 10 match an active official record: Alan L Cassel (U.S. Patent and Trademark Office), Bruce T Atkins (Bruce T. Atkins Intellectual Property) (U.S. Patent and Trademark Office), Joseph M. Ellsworth (U.S. Patent and Trademark Office), Lloyd G Buchanan (U.S. Patent and Trademark Office) and Martha Ann Michaels (Law Office of Martha A. Michaels) (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 .
Cities in St. Charles County
Communities served
Wentzville, Lake St. Louis, Dardenne Prairie, Cottleville, Weldon Spring, St. Paul, Foristell, Flint Hill, New Melle, Josephville, West Alton, Portage Des Sioux, Augusta, Defiance, Weldon Spring Heights