The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 14, 1992
Filed:
Feb. 28, 1991
Applicant:
Inventor:
Stanley Knapczyk, Justice, IL (US);
Assignee:
Motorola, Inc., Schaumburg, IL (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H04L / ;
U.S. Cl.
CPC ...
380 50 ; 380 21 ; 380 52 ;
Abstract
A method for backing up and erasing encryption keys that provides a backup power supply (110) so that keys stored in a memory (104) will not be lost inadvertently, while still permitting keys to be erased, either in response to a low battery condition in the absence of the main supply (101), or in response to an external key erase input (105).