Pay-tv time purchase scheme
US5070400A · kind A · utility
47Cited by
16References
15Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jan 19, 1989 |
| Grant date | Dec 3, 1991 |
| Priority date | — |
| Expiry date | Jan 19, 2009 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N7/165
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A pay television subscriber pays for viewing credits which are transmitted to the subscriber equipment from a central office. Each program is associated with a pulse having a rate corresponding to the charge per unit time for that program, and the viewing credits are debited appropriately.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.