Inventor
GUSTAFSON DAVID T
US7 patents
Patents
7 patentsUS5524134AJun 4, 1996
Telecommunications security module
MOTOROLA INC27 citations91
US5696880ADec 9, 1997
Communication system user authentication method
MOTOROLA INC47 citations86
US6819286B2Nov 16, 2004
Location determination for mobile units
MOTOROLA INC17 citations83
US5751718AMay 12, 1998
Simultaneous transfer of voice and data information using multi-rate vocoder and byte control protocol
MOTOROLA INC17 citations82
USD348470SJul 5, 1994
Auxiliary terminal for use with secure telephone unit
MOTOROLA INC8 citations73
US5506889AApr 9, 1996
Digital voice privacy apparatus and method
MOTOROLA INC7 citations68
USD352030SNov 1, 1994
Telephone module
MOTOROLA INC3 citations58