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:
Sep. 03, 1991
Filed:
Jul. 26, 1990
Hiroshi Takizawa, Tokyo, JP;
NEC Corporation, , JP;
Abstract
A lock control method for on-board terminal equipment of a mobile telecommunications network surely inhibits persons other than the user or an authorized person person from unlocking the equipment with the intention of originating a call thereon. When a unauthorized person enters a lock code resembling a set first lock code, or unlock code, by chance after a great number of lock codes, the first lock code is replaced with a second lock code. Hence, the unauthorized person cannot unlock the equipment despite that the entered code may coincide with the first lock code. While the unauthorized person may further enter other different lock codes, the second lock code serving as the unlock code will be replaced with the first lock code as the entered code approaches the second lock code.