US3453604A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Optical memory device employing multiphoton-excited fluorescing material to reduce exposure crosstalk
Assignee: AT&T Inc
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Filing: 1966-11-15
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Granted: 1969-07-01
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Expires: 1986-11-15
Abstract
No abstract record available.
Inventors
- 👤 Joseph E Geusic
- 👤 Shobha Singh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 18:23
CPC Classifications
G; G11; G11C; G11C13/00; G11C13/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
78 words
A SYSTEM FOR INDICATING THE PRESENCE OR ABSENCE OF INFORMATION COMPRISING, IN COMBINATION: AN OPTICAL INFORMATION INPUT MEANS HAVING A GIVEN FREQUENCY AND AN INTENSITY WHICH VARES ABOVE AND BELOW A PRESELECTED THRESHOLD LEVEL; AN ELEMENT OF A MULTIPHOTON-EXCITED FLUORESCING MATERIAL WHICH, IN RESPONSE TO RADATION FROM SAID SOURCE HAVING AN INTENSITY IN EXCESS OF SAID THRESHOLD LEVEL, EMITS FLUORESCENT RADIATION HAVING A FREQUENCY DIFFERENT FROM THAT OF SAID SOURCE; AND MEANS FOR SELECTIVELY DETECTING SAID FLUORESCENT RADIATION.
Claim 2
Independent Claim
78 words
A SYSTEM FOR INDICATING THE PRESENCE OR ABSENCE OF INFORMATION COMPRISING, IN COMBINATION: AN OPTICAL INFORMATION INPUT MEANS HAVING A GIVEN FREQUENCY AND AN INTENSITY WHICH VARES ABOVE AND BELOW A PRESELECTED THRESHOLD LEVEL; AN ELEMENT OF A MULTIPHOTON-EXCITED FLUORESCING MATERIAL WHICH, IN RESPONSE TO RADATION FROM SAID SOURCE HAVING AN INTENSITY IN EXCESS OF SAID THRESHOLD LEVEL, EMITS FLUORESCENT RADIATION HAVING A FREQUENCY DIFFERENT FROM THAT OF SAID SOURCE; AND MEANS FOR SELECTIVELY DETECTING SAID FLUORESCENT RADIATION.
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) | 1972-06-30 | 1972-12-30 | 1973-07-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-06-30 | 1976-12-30 | 1977-07-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-06-30 | 1980-12-30 | 1981-07-01 | $7700.00 | Window Closed / Lapsed |