Inventor
EVANS WALTER R
US15 patents
⚠️ This page may combine multiple inventors who share the name “EVANS WALTER R”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.
SARGENT & GREENLEAF
11 patentsUS4961330AOct 9, 1990
High security panic exit system
SARGENT & GREENLEAF119 citations95
US4241594ADec 30, 1980
Slide cover type changeable key plug padlock
SARGENT & GREENLEAF31 citations92
US4776187AOct 11, 1988
Changeable key cylinder exposed shackle padlock
SARGENT & GREENLEAF49 citations90
US4763496AAug 16, 1988
High security changeable key cylinder type shackle padlock
SARGENT & GREENLEAF31 citations90
US4404823ASep 20, 1983
View limiting dial and ring structure for combination locks and the like
SARGENT & GREENLEAF22 citations81
US4359886ANov 23, 1982
Key lock cylinder for possibly contaminated environments
SARGENT & GREENLEAF28 citations78
US4651546AMar 24, 1987
High security rotary disc, pin tumbler type cylinder lock
SARGENT & GREENLEAF16 citations73
US4462230AJul 31, 1984
Changeable safe deposit lock with slidable clamped fences
SARGENT & GREENLEAF20 citations73
US4643010AFeb 17, 1987
Two movement time lock
SARGENT & GREENLEAF11 citations72
US4875351AOct 24, 1989
Electronic time lock
SARGENT & GREENLEAF13 citations68
US4580424AApr 8, 1986
Single lever, double changeable safe deposit lock
SARGENT & GREENLEAF6 citations62
MAS HAMILTON GROUP
3 patentsUS5893283AApr 13, 1999
Solenoid controlled bolt control for an electronic lock
MAS HAMILTON GROUP73 citations94
US6151935ANov 28, 2000
Deadbolt combination lock system with automatic locking spring bolt
MAS HAMILTON GROUP22 citations92
US5881589AMar 16, 1999
Gear driven bolt withdrawal for an electronic combination lock
MAS HAMILTON GROUP41 citations92