US3417381A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for writing information in memory by light
Assignee: International Business Machines Corp
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Filing: 1965-06-21
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Granted: 1968-12-17
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Expires: 1985-06-21
Abstract
No abstract record available.
Inventors
- 👤 Glenn T Sincerbox
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 21:31
CPC Classifications
G; G11; G11C; G11C13/00; G11C13/04; G11C13/042; G11C13/041
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
148 words
APPARATUS FOR WRITING INFORMATION INTO MEMORY COMPRISING, IN COMBINATION: A PHOTOGRAPHIC EMULSION IN WHICH INFORMATION MAY BE WRITTEN BY EXPOSING IT TO LIGHT, A NORMALLY TRANSPARENT PLATE TO PHOTOCHROMIC MATERIAL AT THE INPUT SIDE OF SAID EMULSION, SAID PLATE BECOMING OPAQUE WHEN EXPOSED TO ULTRAVIOLET LIGHT AND TRANSPARENT AGAIN WHEN EXPOSED TO INFRARED LIGHT, AN ANALYZER BETWEEN SAID PLATE AND SAID EMULSION FOR BLOCKING THE FLOW OF LIGHT TO THE LATTER EXCEPT WHEN IT IS POLARIZED IN A GIVEN DIRECTION, MEANS FOR EXPOSING SAID PLATE TO ULTRAVIOLET LIGHT AND INFRARED LIGHT IN SUCH A WAY THAT SELECTED AREAS ARE TRANSPARENT WHILE THE REMAINING AREAS ARE OPAQUE, SAID ULTRAVIOLET AND INFRARED LIGHT BEING POLARIZED IN A DIRECTION TO BE BLOCKED BY SAID ANALYZER, AND MEANS FOR EXPOSING SAID PLATE TO LIGHT AT A SELECTED FREQUENCY AND POLARIZED IN A DIRECTION TO PASS THROUGH SAID ANALYZER TO SAID PHOTOGRAPHIC EMULSION.
Claim 2
Dependent Claim
148 words
APPARATUS FOR WRITING INFORMATION INTO MEMORY COMPRISING, IN COMBINATION: A PHOTOGRAPHIC EMULSION IN WHICH INFORMATION MAY BE WRITTEN BY EXPOSING IT TO LIGHT, A NORMALLY TRANSPARENT PLATE TO PHOTOCHROMIC MATERIAL AT THE INPUT SIDE OF SAID EMULSION, SAID PLATE BECOMING OPAQUE WHEN EXPOSED TO ULTRAVIOLET LIGHT AND TRANSPARENT AGAIN WHEN EXPOSED TO INFRARED LIGHT, AN ANALYZER BETWEEN SAID PLATE AND SAID EMULSION FOR BLOCKING THE FLOW OF LIGHT TO THE LATTER EXCEPT WHEN IT IS POLARIZED IN A GIVEN DIRECTION, MEANS FOR EXPOSING SAID PLATE TO ULTRAVIOLET LIGHT AND INFRARED LIGHT IN SUCH A WAY THAT SELECTED AREAS ARE TRANSPARENT WHILE THE REMAINING AREAS ARE OPAQUE, SAID ULTRAVIOLET AND INFRARED LIGHT BEING POLARIZED IN A DIRECTION TO BE BLOCKED BY SAID ANALYZER, AND MEANS FOR EXPOSING SAID PLATE TO LIGHT AT A SELECTED FREQUENCY AND POLARIZED IN A DIRECTION TO PASS THROUGH SAID ANALYZER TO SAID PHOTOGRAPHIC EMULSION.
References Cited (Backward Citations)
US3174140A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-12-17 | 1972-06-17 | 1972-12-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-12-17 | 1976-06-17 | 1976-12-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-12-17 | 1980-06-17 | 1980-12-17 | $7700.00 | Window Closed / Lapsed |