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. 28, 1999
Filed:
Jul. 31, 1996
Semyon Mizikovsky, Morganville, NJ (US);
Geoffrey Anderson, San Diego, CA (US);
Gerard Wahl, Kendall Park, NJ (US);
Peter Douma, Wyckoff, NJ (US);
Masaaki Akahane, Mahwah, NJ (US);
Sony Corporation, Tokyo, JP;
Sony Electronics, Inc., Park Ridge, NJ (US);
Abstract
Tone generating apparatus for a cellular telephone simulates those tones normally sensed by a user of a conventional land-line telephone. The cellular telephone is adapted to communicate with a base station via a service provider which provides different types of service, such as HOME service, ROAM service, or alternate HOME service. A progress tone generator is actuable to generate for the user selected dial tone indications as a function of the detected type of service provided by the service provider. In addition, when the keypad of the cellular telephone is operated, digit tones identifying the actuation of the respective keys are generated as is digit data which represents those keys; the digit data being transmitted to the base station to dial a respective telephone number. A warning indication, such as a distinctive tone, is generated in the event that the digit data does not represent a valid telephone number.