US3355293A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Conversion of benzo-indolinospiropyran image to fixed red image
Assignee: Appvion LLC
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Filing: 1964-02-26
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Granted: 1967-11-28
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Expires: 1984-02-26
Abstract
No abstract record available.
Inventors
- 👤 Peter L Foris
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 06:38
CPC Classifications
G; G03; G03C; G03C5/00; G03C5/56; G03C1/00; G03C1/685; Y; Y10; Y10S; Y10S430/00; Y10S430/163
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
56 words
THE PROCESS FOR CONVERTING AN IMAGE FORMED BY ULTRAVIOLET LIGHT IN A THIN LAYER OF MOLECULES OF A ENZOINDOLINOSPIROPYRAN WHICH CONSISTS OF THE STEPS OF (A) SUBJECTING THE LAYER TO NO2 GAS; AND (B) SUBJECTING THE LAYER OF (A) TO HEAT SUFFICIENT TO RAISE THE TEMPERATURE UNTIL THE IMAGE BECOMES RED IN HUE BY REFLECTED LIGHT.
Claim 2
Dependent Claim
56 words
THE PROCESS FOR CONVERTING AN IMAGE FORMED BY ULTRAVIOLET LIGHT IN A THIN LAYER OF MOLECULES OF A ENZOINDOLINOSPIROPYRAN WHICH CONSISTS OF THE STEPS OF (A) SUBJECTING THE LAYER TO NO2 GAS; AND (B) SUBJECTING THE LAYER OF (A) TO HEAT SUFFICIENT TO RAISE THE TEMPERATURE UNTIL THE IMAGE BECOMES RED IN HUE BY REFLECTED LIGHT.
References Cited (Backward Citations)
US3212898A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-11-27 | 1971-05-29 | 1971-11-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-11-27 | 1975-05-29 | 1975-11-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-11-27 | 1979-05-29 | 1979-11-28 | $7700.00 | Window Closed / Lapsed |