Registered patent attorney
John T Callahan
Firm
Sughrue Mion, PLLC
Address
2000 Pennsylvania Ave NW
Washington, DC, 20006
US
Phone
Registered as
Registered patent attorney
Other attorneys at Sughrue Mion, PLLC
- Jae Seok AhnUSPTO Reg. 78937 · Washington, DC
- Ian C BarrasUSPTO Reg. 62812 · New Orleans, LA
- John Michael BirdUSPTO Reg. 46027 · Washington, DC
- Mark BolandUSPTO Reg. 32197 · Washington, DC
- Young H. ChonUSPTO Reg. 67967 · Washington, DC
- Joshua S. DeanUSPTO Reg. 72682 · Washington, DC
- Albert DeCadyUSPTO Reg. 60658 · Washington, DC
- Tyler P. Del RosarioUSPTO Reg. 72943 · Washington, DC
Other patent attorneys in Washington, District of Columbia
- Alisa S AbbottBanner Witcoff
- Ahmed Abdel-RahmanPillsbury Winthrop Shaw Pittman LLP
- Margaret A AbernathyBaker & Hostetler LLP
- Michael T. AbramsonJordan IP Law
- Khadija Abdulkadir AbuHoward University School of Law
- Deepa AcharyaQuinn Emanuel UrQuhart & Sullivan LLP
- Canek AcostaMayer Brown LLP
- Stephanie N. AdamakosPaul Hastings LLP
Frequently asked
Frequently asked about John T Callahan
Is John T Callahan a registered patent attorney?
Yes. John T Callahan is a registered patent attorney with the United States Patent and Trademark Office (USPTO Registration Number 32607). Registration is verified against the USPTO Office of Enrollment and Discipline roster.
Where is John T Callahan located?
John T Callahan's office is in Washington, District of Columbia (20006). Affiliated with Sughrue Mion, PLLC.
What firm does John T Callahan work at?
John T Callahan is listed as affiliated with Sughrue Mion, PLLC on the USPTO Office of Enrollment and Discipline practitioner roster.
How do I contact John T Callahan?
John T Callahan's office phone (per the USPTO public roster) is 202-663-7387. 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.