04528459 is referenced by 112 patents and cites 7 patents.

Switching apparatus for connecting a device requiring a backup power source to a battery bus upon disconnect or failure of the primary power source, without interruption of power, and without loading the backup power source when the device is off. Therefore, the apparatus provides nearly total or complete isolation of the backup source from the load when the device (load) is off.

Title
Battery backup power switch
Application Number
6/503215
Publication Number
4528459
Application Date
June 10, 1983
Publication Date
July 9, 1985
Inventor
Roger E Wiegel
Toddville
IA, US
Agent
H Fredrick Hamann
George A Montanye
Robert C Mayes
Assignee
Rockwell International Corporation
CA, US
IPC
H02J 9/06
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