Inventor
FIELD PETER H
US27 patents
⚠️ This page may combine multiple inventors who share the name “FIELD PETER H”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.
MEDECO SECURITY LOCKS
21 patentsUS5570601ANov 5, 1996
Hierarchical cylinder lock and key system
MEDECO SECURITY LOCKS53 citations96
US5419168AMay 30, 1995
Hierarchical cylinder lock and key system
MEDECO SECURITY LOCKS53 citations96
US6477875B2Nov 12, 2002
Rotating pin tumbler side bar lock with side bar control
MEDECO SECURITY LOCKS117 citations95
US6945082B2Sep 20, 2005
Key blank, key and master keying system
MEDECO SECURITY LOCKS58 citations92
US6023954AFeb 15, 2000
Keys for cylinder locks
MEDECO SECURITY LOCKS35 citations92
US5615565AApr 1, 1997
Keys for cylinder locks
MEDECO SECURITY LOCKS33 citations92
US5289709AMar 1, 1994
Pin tumblers and corresponding keys for cylinder locks
MEDECO SECURITY LOCKS41 citations92
US5088306AFeb 18, 1992
Cylinder lock with changeable keyway
MEDECO SECURITY LOCKS51 citations92
US6578396B2Jun 17, 2003
Removable cylindrical lock core
MEDECO SECURITY LOCKS45 citations91
US9771738B2Sep 26, 2017
Flat-bladed key
MEDECO SECURITY LOCKS8 citations83
US9416561B2Aug 16, 2016
Cylinder lock configured to be operated by a flat-bladed key
MEDECO SECURITY LOCKS13 citations83
US9045915B2Jun 2, 2015
Key with movable element disposed within key blade
MEDECO SECURITY LOCKS7 citations81
US7412860B1Aug 19, 2008
Key blank and key
MEDECO SECURITY LOCKS11 citations81
US7797973B2Sep 21, 2010
Hierarchical cylinder lock systems
MEDECO SECURITY LOCKS21 citations80
USD324480SMar 10, 1992
Dropbolt lock
MEDECO SECURITY LOCKS14 citations73
US5044181ASep 3, 1991
Dropbolt lock assembly
MEDECO SECURITY LOCKS19 citations73
US9359793B2Jun 7, 2016
Cylinder lock with internal slider and key therefore
MEDECO SECURITY LOCKS6 citations72
US7788956B2Sep 7, 2010
Lock, key blank, and key of a hierarchical lock system
MEDECO SECURITY LOCKS5 citations71
US7552608B2Jun 30, 2009
Lock, key blank, and key of a hierarchical lock system
MEDECO SECURITY LOCKS7 citations71
US9482031B2Nov 1, 2016
Cylinder lock including multiple cooperating sidebars for controlling the lock
MEDECO SECURITY LOCKS5 citations69
US7895865B2Mar 1, 2011
Cylinder lock assembly with a tailpiece rotationally coupled to the cylinder plug
MEDECO SECURITY LOCKS5 citations59
ASSA ABLOY HIGH SECURITY GROUP INC
4 patentsUS11280111B2Mar 22, 2022
Operating a lock cylinder with multiple, supplemental locking elements
ASSA ABLOY HIGH SECURITY GROUP INC2 citations69
US12196000B2Jan 14, 2025
Cylinder lock with multiple, supplemental locking elements and associated key
ASSA ABLOY HIGH SECURITY GROUP INC0 citations59
US12077983B2Sep 3, 2024
Key and key blanks operable in vertically and horizontally oriented keyways
ASSA ABLOY HIGH SECURITY GROUP INC1 citations59
US11624206B2Apr 11, 2023
Lock cylinder and key with multiple, supplemental locking elements
ASSA ABLOY HIGH SECURITY GROUP INC1 citations59