Storage medium,method for recording information thereon,and apparatus for retrieving the information therefrom
Abstract
Abstract A STORAGE MEDIUM, METHOD FOR RECORDING INFORMATION ON THE MEDIUM AND APPARATUS FOR RETRIEVING THE INFORMATION IN WHICH THE INFORMATION IS STORED AS AN ALTERATION IN THE STORAGE MEDIUM WHICH ALTERATION CAUSES A PHASE MODULATION OF A BEAM OF LIGHT USED IN RETRIEVING THE INFORMATION. FOR EXAMPLE THE ALTERATION MAY BE EITHER AN INTERNAL ALTERATIONS, EITHER A CROSS LINKED MOLECULES OF A PLASTIC STORAGE MEDIUM, OR THE BLEACHING OF THE EXPOSED PHOTOGRAPIC MATERIALS TO PRODUCE LIGHT TRANSMITTING SILVER SALTS HAVING A DIFFERENT INDEX OF REFRACTION THAN THE UNEXPOSED PORTIONS, OR THE FORMATION OF A SURFACE RELIEF TO CAUSE A PHASE MODULATION OF A LASER BEAM PROJECTED THROUGH THE MEDIUM OR REFLECTED THEREBY. THE FORMATION OF THE SURFACE RELIEFS CAN BE ACCOMPLISHED BY PLASTICALLY DEFORMING THE SURFACE OF THE MEDIUM, BY FUSING, BY LOCALLY EVAPORATING PORTIONS OF THE SURFACE OF THE MEDIUM, OR BY LOCAL ETCHING. APPARATUSES FOR RETRIEVING THE INFORMATION CAN INCLUDE EITHER FILTERS OR PHASE SHIFTERS WHICH CHANGE A PHASE MODULATED BEAM OF LIGHT INTO INTENSITY MODULATED OR AMPLITUDE MODULATED BEAM OF LIGHT.
Inventors
- 👤 P Graf
- 👤 D Roess
Bibliographic Details
Claims Analysis
Total Claims: 0References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-09-23 | 1978-03-25 | 1978-09-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-23 | 1982-03-25 | 1982-09-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-23 | 1986-03-25 | 1986-09-24 | $7700.00 | Window Closed / Lapsed |