| Patents for H04N 21 - Selective content distribution, e.g. interactive television, vod [video on demand] (56,445) |
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| 12/09/1986 | US4628351 Cooking apparatus with a video display |
| 12/02/1986 | US4626904 Meter for passively logging the presence and identity of TV viewers |
| 09/17/1986 | EP0194769A1 Cryptographic system for a direct broadcast by satellite network |
| 09/15/1986 | EP0177512A4 Preprogrammed over-the-air marketing research system. |
| 07/22/1986 | US4602279 Method for providing targeted profile interactive CATV displays |
| 06/17/1986 | CA1206259A1 Computer generated synthesized imagery |
| 05/20/1986 | US4590516 Recorded program communication system |
| 04/29/1986 | CA1203889A1 Channel assignment for catv system |
| 04/16/1986 | EP0177512A1 Preprogrammed over-the-air marketing research system |
| 04/01/1986 | CA1202714A1 Television viewer data collection system |
| 02/04/1986 | US4569026 TV Movies that talk back |
| 01/21/1986 | US4566030 System for monitoring habits of cooperating television viewers |
| 12/18/1985 | EP0164983A2 System for enabling descrambling on a selective-subscription basis in a subscriber communication network |
| 12/03/1985 | US4556904 Teletext system having user prompt commands |
| 10/10/1985 | WO1985004543A1 Preprogrammed over-the-air marketing research system |
| 10/08/1985 | US4546382 Television and market research data collection system and method |
| 09/24/1985 | CA1194213A1 Sync suppression scrambling of television signals for subscription tv |
| 07/02/1985 | US4527194 Channel assignment for CATV system |
| 07/02/1985 | CA1189953A1 Interface apparatus and method for asynchronous encoding of digital television |
| 06/19/1985 | EP0144835A2 Pcm-frame synchronizing unit |
| 06/12/1985 | EP0144077A2 Integrated services digital transmission network |
| 06/12/1985 | EP0144076A2 Integrated services digital transmission network |
| 06/12/1985 | EP0144075A2 Integrated services digital transmission network |
| 03/19/1985 | US4506387 Programming-on-demand cable system and method |
| 12/19/1984 | EP0128481A2 Television viewer data collection system |
| 11/20/1984 | US4484217 Method and system for remote reporting, particularly for pay television billing |
| 10/30/1984 | CA1177153A1 Television signal converting apparatus providing an on-screen tuning display |
| 10/23/1984 | US4479142 Interface apparatus and method for asynchronous encoding of digital television |
| 09/11/1984 | EP0108143A4 Method and system for remote reporting, particularly for pay television billing. |
| 08/14/1984 | US4466017 Sync suppression scrambling of television signals for subscription TV |
| 05/16/1984 | EP0108143A1 Method and system for remote reporting, particularly for pay television billing. |
| 04/24/1984 | US4445187 Video games with voice dialog |
| 11/24/1983 | WO1983004154A1 Method and system for remote reporting, particularly for pay television billing |
| 09/20/1983 | US4405946 Television signal converting apparatus providing an on-screen tuning display |
| 07/07/1983 | WO1983002378A1 Sync suppression scrambling of television signals for subscription tv |
| 04/26/1983 | US4381522 Selective viewing |
| 02/09/1983 | EP0071057A2 Communication system with a switching arrangement for broadband signals |
| 08/24/1982 | US4346473 Error correction coding method and apparatus for multilevel signaling |
| 06/01/1982 | US4333152 TV Movies that talk back |
| 05/26/1981 | CA1102022A1 Programming and selection monitoring system for television receivers |
| 04/28/1981 | US4264924 Dedicated channel interactive cable television system |
| 05/23/1978 | US4091413 Security system for pay-TV channel |
| 03/28/1978 | US4081753 Automatic programming system for television receivers |
| 06/08/1976 | US3962535 Conditional replenishment video encoder with sample grouping and more efficient line synchronization |
| 01/20/1976 | US3934079 Bilateral communications system for distributing commerical and premium video signaling on an accountable basis |