Rolf E. Rothfjell

EA Esselte Security Systems Ab: 2 patents #1 of 6Top 20%

📍 Kalix, SE: #1 of 18 inventorsTop 6%

Overall (All Time): #1,677,632 of 4,157,543Top 45%

Patents All Time

Issued Patents All Time

Showing 1–3 of 3 patents

Patent #	Title	Co-Inventors	Date
4590366	Method of securing simple codes	—	1986-05-20
4581482	Method and device for signature verification	—	1986-04-08
4464448	Method of producing an identity document	—	1984-08-07