US3635538A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stacked hologram apparatus
Assignee: Unisys Corp
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Filing: 1970-02-27
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Granted: 1972-01-18
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Expires: 1990-02-27
Abstract
Abstract A data storage device including a stack of birefringent crystalline holographic plates serially disposed in the path of a playback beam and further including means cooperating with the holographic plates for selectively activating one of them to produce an image of the data recorded therein.
Inventors
- 👤 Henry John Caulfield
- 👤 Donald H Mcmahon
- 👤 Richard A Soref
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 09:43
CPC Classifications
G; G11; G11C; G11C13/00; G11C13/04; G11C13/042; G11C13/044; G03; G03H; G03H1/00; G03H1/26; G03H1/02; G03H2001/026; G03H2001/0268; G03H2001/2605; G03H2001/261
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
50 words
The apparatus of claim 1 including a viewing screen positioned to receive the diffracted data beam from the respective holograms for providing a visual display of the readout data and wherein each hologram is so constructed as to direct its data beam onto a common region of said viewing screen.
References Cited (Backward Citations)
US2982176A
Cited
US3423736A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-01-17 | 1975-07-19 | 1976-01-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-17 | 1979-07-19 | 1980-01-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-17 | 1983-07-19 | 1984-01-18 | $7700.00 | Window Closed / Lapsed |