Patent US3440621A successfully refreshed from Google Patents.
US3440621A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Color center information storage and retrieval system
Assignee: CARSON LAB Inc
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Filing: 1966-02-11
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Granted: 1969-04-22
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Expires: 1986-02-11
Abstract
No abstract record available.
Inventors
- 👤 Richard A Knapp
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:09
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/72; G03C1/725; G11; G11C; G11C13/00; G11C13/04; G11C13/041
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
107 words
AN INFORMATION HANDLING SYSTEM COMPRISING A CRYSTAL HAVING COLOR CENTERS AND HYDROGEN ATOMS THEREIN EXTERNAL OF SAID COLOR CENTERS, COLOR CENTERS IN SAID CRYSTAL HAVING THE CAPACITY TO GROUP TOGETHER IN THE PRESENCE OF HYDROGEN, MEANS FOR SELECTIVELY ILLUMINATING AT LEAST PART OF SAID CRYSTAL WITH A FIRST LIGHT OF SELECTED WAVELENGTH TO CAUSE PLURALITIES OF COLOR CENTERS IN SAID ILLUMINATED PART TO GROUP TOGETHER TO FORM INFORMATION CENTERS REPRESENTING STORED INFORMATION, AND MEANS FOR ILLUMINATING AT LEAST PART OF SAID CRYSTAL WITH A SECOND LIGHT OF ULTRAVIOLET WAVELENGTH TO REESTABLISH COLOR CENTERS FROM SAID INFORMATION CENTERS IN SAID ULTRAVIOLET ILLUMINATED PART TO ERASE STORED INFORMATION THEREIN.
References Cited (Backward Citations)
US2481622A
Cited
US3125741A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-04-21 | 1972-10-21 | 1973-04-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-04-21 | 1976-10-21 | 1977-04-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-04-21 | 1980-10-21 | 1981-04-22 | $7700.00 | Window Closed / Lapsed |