Dennis J. Callahan

📍 Annapolis, MD: #235 of 661 inventorsTop 40%

🗺 Maryland: #13,387 of 35,612 inventorsTop 40%

Overall (All Time): #2,057,239 of 4,157,543Top 50%

Patents All Time

Issued Patents All Time

Showing 1–2 of 2 patents

Patent #	Title	Co-Inventors	Date
8821420	Hand and wrist restorer	—	2014-09-02
4235459	Marking system	—	1980-11-25