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:
Jun. 30, 1987
Filed:
Oct. 17, 1984
Anthony C Fascenda, Pacifica, CA (US);
Lotus Information Network Corp., San Mateo, CA (US);
Abstract
An apparatus and a method of providing an access control for transmitted stock market data from a central radio station to a plurality of one-way radio receivers. Into each receiver is inputted an access code including a cypher pointer which provides for scrambling of the remainder of the access code which includes the authorized services, the service cutoff date, and the unit serial number which is unique to a particular receiver. The cypher pointer is used to rotate a common map in the receiver used for unscrambling and in the central station used for scrambling. In order to receive service, the permanently stored serial number of the unit must compare with the serial number of the access code, the cutoff date must be greater than the present system date transmitted from the central station, and there must be an authorized service class.