Professional Records
Medicine Doctors
Jonathan Lindquist Phones & Addresses
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Cedar City, UT
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Wasilla, AK
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Talkeetna, AK
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Willow, AK
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Plano, TX
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Hibbing, MN
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Anchorage, AK
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Mountain Iron, MN
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Meadowlands, MN
Industries
Animation
Resumes
Resumes
Student At Madison Area Technical College
View pageLocation:
United States
Industry:
Animation
Publications
Us Patents
Integrated Alarm And Access Control System
View pageUS Patent:
50032909, Mar 26, 1991
Filed:
Jan 11, 1990
Appl. No.:
7/463393
Inventors:
Jonathan B. Lindquist - Plano TX
Granger W. Smith - Melissa TX
Granger W. Smith - Melissa TX
International Classification:
G08B 1308
US Classification:
340545
Abstract:
An integrated alarm and access control system includes an access control package, an intrusion detection package and an interface unit. A position sensor determines if a door is open or closed and an electrically activated locking device locks the door in its closed position. A supervisory circuit provides line security. A door position relay and a first timer prevent an alarm signal from the supervisory circuit if the door is open and the egress device is actuated for a time period. A door control relay activates locking devices and a second timer responds to the door control relay, the egress device and the door position relay to give a prealarm signal. Fail-safe and fail-secure circuits are included.