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:
Aug. 05, 1997
Filed:
Mar. 30, 1995
Randolph W McKernan, Graton, CA (US);
Christian Christmas, Graton, CA (US);
Other;
Abstract
A cellular phone identity protection system that protects the identities of cellular telephones as they initiate calls through a cellular telephone system. The identity protection is provided through the use of jamming techniques and intentional false and tagged identity transmissions designed to prevent criminals from receiving valid subscribers' mobile identities over the airwaves. Jamming transmissions are made on the same frequency as the mobile transmissions, overpowering the valid mobile signals at the criminals' receivers, thereby preventing the criminals' equipment from properly decoding the MIN, ESN, SCM and other valid data transmitted by the valid mobile unit. These same jamming transmissions are fed, 180 degrees out of phase and level adjusted, into the receive antenna lines of the cell site control channel, canceling the effects of the jamming at the cell site receivers thereby allowing valid mobile call attempts to be processed normally. False and tagged identities are transmitted in the form of call attempts and registrations on the reverse control channel served by the local cell site. These fill up the collection equipment of the criminals with useless or trackable data. Valid mobile call attempt data is made available pre-call to external systems though a data port.