Patent US4458345A successfully refreshed from Google Patents.
US4458345A
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Process for optical information storage
Assignee: International Business Machines Corp
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Filing: 1982-03-31
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Granted: 1984-07-03
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Expires: 2002-03-31
Abstract
Abstract Information is stored by a process involving the steps of (1) sensitizing a recording medium comprising a two-photon, four-level material by exposing said medium to flood illumination with ultra-violet or visible light, and then (2) exposing the sensitized medium simultaneously to two beams of coplanar laser irradiation intersecting within said recording medium to create a microscopic interference pattern.
Inventors
- 👤 Gary C. Bjorklund
- 👤 Donald M. Burland
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:17
CPC Classifications
G; G11; G11B; G11B7/00; G11B7/004; G11B7/0065; G11B7/24; G11B7/26; G03; G03H; G03H1/00; G03H1/04; G03H1/18; G03H1/181; G03H1/02; G03H2001/026; G03H2001/0264; G03H2222/00; G03H2222/34; G03H2260/00; G03H2260/50; G03H2260/54; Y; Y10; Y10S; Y10S359/00; Y10S359/90
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
58 words
A process for storing information characterized by the steps of: (1) sensitizing a recording medium comprising a two-photon, four-level material by exposing said medium to flood illumination with ultra-violet or visible light, and then (2) exposing the sensitized medium simultaneously to two beams of coplanar laser irradiation intersecting within said recording medium to create a microscopic interference pattern.
Claim 2
Dependent Claim
58 words
A process for storing information characterized by the steps of: (1) sensitizing a recording medium comprising a two-photon, four-level material by exposing said medium to flood illumination with ultra-violet or visible light, and then (2) exposing the sensitized medium simultaneously to two beams of coplanar laser irradiation intersecting within said recording medium to create a microscopic interference pattern.
Claim 3
Dependent Claim
17 words
A process as claimed in claim 1 wherein said recording medium is configured as a rotating disk.
Claim 4
Dependent Claim
23 words
A process as claimed in claim 2 wherein the two laser beams are coplanar with the axis of rotation of the recording disk.
Claim 5
Dependent Claim
23 words
A process as claimed in claim 1 wherein the two beams of coplanar laser irradiation intersect below the surface of the recording medium.
Claim 6
Dependent Claim
29 words
A process as claimed in claim 4 wherein the storing process is repeated a plurality of times, each time at a different depth below the surface of the medium.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-07-03 | 1988-01-02 | 1988-07-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-07-03 | 1992-01-02 | 1992-07-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-07-03 | 1996-01-02 | 1996-07-03 | $7700.00 | Window Closed / Lapsed |