Registered patent attorney
Charles S Duan
Firm
American University Washington College of Law
Address
4300 Nebraska Ave NW
Washington, DC, 20016
US
Phone
Registered as
Registered patent attorney
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Frequently asked
Frequently asked about Charles S Duan
Is Charles S Duan a registered patent attorney?
Yes. Charles S Duan is a registered patent attorney with the United States Patent and Trademark Office (USPTO Registration Number 65114). Registration is verified against the USPTO Office of Enrollment and Discipline roster.
Where is Charles S Duan located?
Charles S Duan's office is in Washington, District of Columbia (20016). Affiliated with American University Washington College of Law.
What firm does Charles S Duan work at?
Charles S Duan is listed as affiliated with American University Washington College of Law on the USPTO Office of Enrollment and Discipline practitioner roster.
How do I contact Charles S Duan?
Charles S Duan's office phone (per the USPTO public roster) is 202-274-4124. 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.