Registered patent attorney
Joseph S De Frank
Firm
The Chamberlain Group
Address
300 Windsor Drive
Oakbrook, IL, 60523
US
Phone
Registered as
Registered patent attorney
Frequently asked
Frequently asked about Joseph S De Frank
Is Joseph S De Frank a registered patent attorney?
Yes. Joseph S De Frank is a registered patent attorney with the United States Patent and Trademark Office (USPTO Registration Number 65246). Registration is verified against the USPTO Office of Enrollment and Discipline roster.
Where is Joseph S De Frank located?
Joseph S De Frank's office is in Oakbrook, Illinois (60523). Affiliated with The Chamberlain Group.
What firm does Joseph S De Frank work at?
Joseph S De Frank is listed as affiliated with The Chamberlain Group on the USPTO Office of Enrollment and Discipline practitioner roster.
How do I contact Joseph S De Frank?
Joseph S De Frank's office phone (per the USPTO public roster) is 630-247-1264. 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.