Issued Patents All Time
Showing 1–8 of 8 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4692913 | Method and apparatus for reading a data record carrier | Richard Ackerman, Donovan W. Hurlbut | 1987-09-08 |
| 4603414 | Apparatus for making a data record carrier | Richard Ackerman, Ronald E. Bergsten | 1986-07-29 |
| 4571713 | Digital data record | Richard Ackerman, Donovan H. Hurlbut | 1986-02-18 |
| 4534031 | Coded data on a record carrier and method for encoding same | — | 1985-08-06 |
| 4532616 | Method for optically encoding digital data on a substrate and the data record carrier formed thereby | — | 1985-07-30 |
| 4519054 | Method for formatting optically encoded digital data on a substrate and the data record carrier formed thereby | — | 1985-05-21 |
| 4416001 | Method and apparatus for optically reading digital data inscribed in an arcuate pattern on a data carrier | Richard Ackerman, Donovan W. Hurlbut | 1983-11-15 |
| 4353077 | Optical floppy disc data storage and retrieval techniques | Phillip E. Gokey, Donovan W. Hurlbut, Emma L. Sederholm, Angel F. Terry | 1982-10-05 |