Telephone billing method
US5146491A · kind A · utility
209Cited by
2References
18Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 8, 1991 |
| Grant date | Sep 8, 1992 |
| Priority date | — |
| Expiry date | Aug 8, 2011 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04M2215/0196
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A method of telephone billing comprise providing a toll-free number to a customer to access a provider in a toll-free call from an originating customer telephone number, receiving the originating customer telephone number in response to the toll-free call, converting the toll-free call to a billable call during or after the toll-free call and billing the billable call to the originating customer telephone number.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.