Inventor
DAUM GERALD R
US5 patents
Patents
5 patentsUS4914732AApr 3, 1990
Electronic key with interactive graphic user interface
SUPRA PROD INC267 citations97
US4766746AAug 30, 1988
Electronic real estate lockbox system
SUPRA PROD INC195 citations97
US4916443AApr 10, 1990
Method and apparatus for compiling data relating to operation of an electronic lock system
SUPRA PROD INC116 citations95
US4947163AAug 7, 1990
Electronic security system with configurable key
SUPRA PROD INC94 citations93
US4896246AJan 23, 1990
Electronic lock with energy conservation features
SUPRA PROD INC44 citations91