Communications: electrical – Continuously variable indicating – With meter reading
Patent
1992-01-09
2000-06-06
Zimmerman, Brian
Communications: electrical
Continuously variable indicating
With meter reading
34082544, 34082569, 379103, H04Q 100
Patent
active
060724021
ABSTRACT:
A secure entry system makes use of radio transmissions to communicate with locks, keys, and related components throughout the system. The radio transmissions can be made using a paging system, a cellular telephone system, or any other RF carrier. Some embodiments employ a cellular telephone in lieu of an electronic key. Others integrate a paging receiver within an electronic key to provide a unit with dual functionality. The system is illustrated with reference to exemplary applications in the industrial site security, real estate lockbox, and transportation fields.
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Kniffin John M.
Larson Wayne F.
McCauley Ron
Sherman John W.
Wells, III Ralph H.
SLC Technologies Inc.
Zimmerman Brian
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