Patent US3671096A successfully refreshed from Google Patents.
US3671096A
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US
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Erasable holographic recording
Assignee: United States Department of the Navy
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Filing: 1971-02-03
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Granted: 1972-06-20
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Expires: 1991-02-03
Abstract
Abstract A HOLOGRAPHIC SYSTEM RECORDS OPTICAL INFORMATION ON ALKALI HALIDE CRYSTALS. THE CRYSTALS ARE IRRADIATED WITH AN ELECTRON BEAM PRODUCING DEFECTS IN THE CRYSTALLINE STRUCTURE. THE PRIMARY DEFECT IS IN THE F BAND ALTHOUGH A SMALL NUMBER OF M BANDS ARE FORMED AT THE SAME TIME. THE WAVELENGTH OF A LASER BEAM USED FOR RECORDING FALLS WITHIN THE F ABSORPTION BAND. THIS CONVERTS THE F CENTERS TO R AND M CENTERS. RECONSTRUCTION OF THE HOLOGRAM CAN BE MADE WITH LIGHT WHOSE WAVELENGTH FALLS WITHIN EITHER THE F, R OR M ABSORPTION BAND, THE F BAND BEING DESTRUCTIVE AND THE R AND M BANDS NONDESTRUCTIVE. THE RECORDED INFORMATION CAN BE ERASED BY EXPOSING THE CRYSTAL TO AN ELECTRON BEAM.
Inventors
- 👤 Arthur S Mackin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 15:14
CPC Classifications
G; G11; G11C; G11C13/00; G11C13/04; G11C13/042; G11C13/045; G01; G01D; G01D15/00; G01D15/14; G03; G03H; G03H1/00; G03H1/02; G03H1/024; G03H1/0248; G03H2001/026; G03H2001/0268; G03H1/04; G03H1/0402; G03H2001/0441; G03H1/18; G03H1/182; G03H2001/183; G03H2260/00; G03H2260/30; G03H2260/35; G03H2260/36; G03H2260/50; G03H2260/52; Y; Y10; Y10S; Y10S430/00; Y10S430/143; Y10S430/146
Claims Analysis
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References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-06-20 | 1975-12-20 | 1976-06-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-20 | 1979-12-20 | 1980-06-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-20 | 1983-12-20 | 1984-06-20 | $7700.00 | Window Closed / Lapsed |