Access control device featuring key ordering or key simultaneity

US5705991A · kind A · utility

Assignee

• Supra Products, Inc. · US

Inventors

• John M. Kniffin · Tualatin, US
• Ron McCauley · Salem, US
• Ralph H. Wells, III · Monmouth, US
• John W. Sherman · Houston, US
• Wayne F. Larson · Salem, US

Key dates

• Filing date: Jun 7, 1995
• Grant date: Jan 6, 1998
• Expiry date: Jun 7, 2015

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T70/7446
• WIPO field: Control
• WIPO sector: Instruments

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.