Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4928132 | Optical data storage medium | Robert M. Pettigrew, Victor C. Humberstone, Robert Longman, Peter R. Helfet | 1990-05-22 |
| 4802736 | Interferometers | Robert Longman, Robert M. Pettigrew, Walter T. Welford | 1989-02-07 |
| 4758307 | Method of manufacturing a data storage medium | Robert M. Pettigrew, Victor C. Humberstone | 1988-07-19 |
| 4724444 | Data storage medium | Robert M. Pettigrew, Victor C. Humberstone, Robert Longman, Peter R. Helfet | 1988-02-09 |
| 4703469 | Optical data recording using radiation of different characteristics | Robert M. Pettigrew, Robert Longman | 1987-10-27 |
| 4616237 | Data storage medium | Robert M. Pettigrew, Victor C. Humberstone | 1986-10-07 |
| 4346991 | Method and apparatus for measuring retinal blood flow | Edward R. Pike, David W. Hill | 1982-08-31 |