Issued Patents All Time
Showing 26–50 of 77 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6295360 | Method and apparatus to defeat composite video signal protection | Kordian Kurowski, Ronald Quan | 2001-09-25 |
| 6188832 | Method and apparatus for modifications made to a video signal to inhibit the making of acceptable videotape recordings | — | 2001-02-13 |
| 6091822 | Method and apparatus for recording scrambled video audio signals and playing back said video signal, descrambled, within a secure environment | Andrew Mellows, William J. Wrobleski, Ronald Quan, Gerow D. Brill | 2000-07-18 |
| 5844988 | Method and apparatus for scrambling and descrambling of video signal with edge fill | James R. Holzgrafe | 1998-12-01 |
| 5841863 | Method and apparatus for scrambling and descrambling of video signals with edge fill | James R. Holzgrafe | 1998-11-24 |
| 5784523 | Method and apparatus for defeating effects of color burst modifications to a video signal | Ronald Quan | 1998-07-21 |
| 5754649 | Video media security and tracking system | E. Fraser Morrison, Gregory Clark Copeland | 1998-05-19 |
| 5754648 | Video media security and tracking system | E. Fraser Morrison, Gregory Clark Copeland | 1998-05-19 |
| 5751806 | Audio information dissemination using various transmission modes | — | 1998-05-12 |
| 5659613 | Method and apparatus for copy protection for various recording media using a video finger print | Gregory Clark Copeland | 1997-08-19 |
| 5633927 | Video copy protection process enhancement to introduce horizontal and vertical picture distortions | Ronald Quan | 1997-05-27 |
| 5608799 | Method and apparatus for scrambling and descrambling of video signal with edge fill | Ronald Quan, James R. Holzgrafe, Peter Wonfor | 1997-03-04 |
| 5590195 | Information dissemination using various transmission modes | — | 1996-12-31 |
| 5590194 | Method of and apparatus for scrambling a video signal with full network transmission and recording capability | — | 1996-12-31 |
| 5583936 | Video copy protection process enhancement to introduce horizontal and vertical picture distortions | Peter Wonfor, Alistair Knox, Jeremy Corcoran, Ronald Quan | 1996-12-10 |
| 5581307 | Method and apparatus for scrambling and descrambling of video signals with edge fill | James R. Holzgrafe | 1996-12-03 |
| 5579390 | Method and apparatus for vertically scrambling and descrambling of video signals | Ronald Quan, James R. Holzgrafe, Peter Wonfor | 1996-11-26 |
| 5574787 | Apparatus and method for comprehensive copy protection for video platforms and unprotected source material | — | 1996-11-12 |
| 5524051 | Method and system for audio information dissemination using various modes of transmission | — | 1996-06-04 |
| 5513260 | Method and apparatus for copy protection for various recording media | — | 1996-04-30 |
| 5504815 | Method and apparatus for scrambling and descrambling | Ronald Quan, James R. Holzgrafe, Peter Wonfor | 1996-04-02 |
| RE35078 | Method and apparatus for encrypting and decrypting time domain signals | — | 1995-10-31 |
| 5438620 | Method and apparatus for scrambling and descrambling of video signal with edge fill | Ronald Quan, James R. Holzgrafe, Peter Wonfor | 1995-08-01 |
| 5406626 | Radio receiver for information dissemenation using subcarrier | — | 1995-04-11 |
| 5315448 | Copy protection for hybrid digital video tape recording and unprotected source material | — | 1994-05-24 |