Registered patent attorney
John L. Hertenstein
Firm
AF Holding Company
Address
811 S. Hamilton Street
Sullivan, IL, 61951
US
Registered as
Registered patent attorney
Frequently asked
Frequently asked about John L. Hertenstein
Is John L. Hertenstein a registered patent attorney?
Yes. John L. Hertenstein is a registered patent attorney with the United States Patent and Trademark Office (USPTO Registration Number 74784). Registration is verified against the USPTO Office of Enrollment and Discipline roster.
Where is John L. Hertenstein located?
John L. Hertenstein's office is in Sullivan, Illinois (61951). Affiliated with AF Holding Company.
What firm does John L. Hertenstein work at?
John L. Hertenstein is listed as affiliated with AF Holding Company on the USPTO Office of Enrollment and Discipline practitioner roster.
How do I contact John L. Hertenstein?
John L. Hertenstein's office phone (per the USPTO public roster) is 217-728-8388 EXT. 111. Verify availability and intake details directly with the firm before sending privileged materials.
Should I prepare anything before contacting a patent attorney?
Yes — most patent attorneys quote based on a brief. Persoona's intellectual property module generates a prior-art analysis, defensibility scorecard, and a draft USPTO filing package so you arrive with a brief, not a blank slate. Free to run.
Profile sourced from the USPTO OEDCI Practitioner Roster. Persoona did not provide, edit, or curate this data — every field is pulled directly from the public roster.