Issued Patents All Time
Showing 26–38 of 38 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6839839 | Public key distribution using an approximate linear function | — | 2005-01-04 |
| 6601102 | Secure token-based document server | Margery A. Eldridge, Michael J. Flynn, Christopher Mark JONES, Michael G. Lamming, David L. Pendlebury +2 more | 2003-07-29 |
| 6510359 | Method and system for self-replicating manufacturing stations | Eric G. Parker, George D. Skidmore | 2003-01-21 |
| 6397261 | Secure token-based document server | Margery A. Eldridge, Michael J. Flynn, Christopher Mark JONES, Michael G. Lamming, David L. Pendlebury +2 more | 2002-05-28 |
| 6330549 | Protected shareware | — | 2001-12-11 |
| 5634012 | System for controlling the distribution and use of digital works having a fee reporting mechanism | Mark J. Stefik, Peter L. T. Pirolli | 1997-05-27 |
| 5357548 | Reversible charge transfer and logic utilizing them | — | 1994-10-18 |
| 5157726 | Document copy authentication | Dan S. Bloomberg, John Seely Brown | 1992-10-20 |
| 5003597 | Method and apparatus for data encryption | — | 1991-03-26 |
| 4881264 | Digital signature system and method based on a conventional encryption function | — | 1989-11-14 |
| 4309569 | Method of providing digital signatures | — | 1982-01-05 |
| 4218582 | Public key cryptographic apparatus and method | Martin E. Hellman | 1980-08-19 |
| 4200770 | Cryptographic apparatus and method | Martin E. Hellman, Bailey W. Diffie | 1980-04-29 |