Patent Leaderboard
USPTO Patent Rankings Data through Dec 31, 2025
Home › Keysafe system with timer/calendar features

Keysafe system with timer/calendar features

US Patent 4988987 · Granted Jan 29, 1991

Assignee

Inventors

View full patent text on Google Patents →

More Patents by These Inventors

Locking module2022
Liquid detection apparatus2019
Lock core with recessed pop out knob2017
Restricted range lockbox, access device and methods2017
Lockable container with sacrificial housing and methods for making2015
One-time access for electronic locking devices2014
Key control with real time communications to remote locations2013
Key container with security liner2012
Apparatus for shielding H-field signals2012
Lockbox key with callback feature2011
Personal digital assistant key for an electronic lock2005
Dual mode data logging2005