Patent · US Expired

Telephone dialing paging apparatus method

US5212721A · kind A · utility

28Cited by
8References
18Claims
0Family size

Assignee

Inventors

Key dates

Filing dateAug 18, 1989
Grant dateMay 18, 1993
Priority date—
Expiry dateAug 18, 2009

Classification

  • Technology area (CPC H)Electricity
  • CPC primaryH04M1/275
  • WIPO fieldControl
  • WIPO sectorInstruments

Abstract

A tone only pager including an EEPROM with telephone numbers stored therein at different predetermined addresses and a DTMF signal generator. If a received signal includes one of the predetermined addresses, a DTMF telephone number corresponding to the address is generated. If a received signal also includes a different telephone number, any telephone number stored at that predetermined address may be replaced with the different telephone number. The pager also determines if the telephone number is a long distance telephone number and activates an indicator in response thereto.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.