Patent · US Expired

Data-only telephone service

US6643359B2 · kind B2 · utility

2Cited by
2References
20Claims
0Family size

Assignee

Inventors

Key dates

Filing dateMay 25, 2001
Grant dateNov 4, 2003
Priority date—
Expiry dateMay 25, 2021

Classification

  • Technology area (CPC H)Electricity
  • CPC primaryH04M2215/7886
  • WIPO fieldTelecommunications
  • WIPO sectorElectrical engineering

Abstract

Data-only telephone service is supported by determining if a call placed from a telephone line, designated as data-only, is to a validated data line. If not, the call is disconnected.

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