Patent US3734733A successfully refreshed from Google Patents.
US3734733A
Expired / Lapsed
US
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Positive working photo-thermographic materials containing bi-imidazolyl compounds and reducing agents and the use thereof in color development
Assignee: Agfa Gevaert NV
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Filing: 1971-04-08
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Granted: 1973-05-22
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Expires: 1991-04-08
Abstract
Abstract A RECORDING ELEMENT CARRYING A PHOTO-OXIDIZING BIIMIDAZOLYL COMPOUND IS CHEMICALLY REACTIVE CONTACT WITH A COMPOUND HAVING REDUCING PROPERTIES IN IMAGEWISE EXPOSED TO ACTIVATING RADIATION TO EFFECT REACTION BETWEEN THE BI-IMIDAZOLYL COMPOUND IN THE EXPOSES AREAS OF THE ELEMENT AND THE REDUCING COMPOUND TO DESTROY THEREDUCING PROPERTIES OF THE LATTER IN SUCH EXPOSED AREA AND THEREAFTER THE EXPOSED ELEMENT IS UNIFORMLY CONTACTED WITH AN IMAGE-FORMING COMPOUND WHICH IS REACTIVE ON HEATING WITH SAID REDUCING COMPOUND TO PRODUCE A DISTINCTIVE COLORATION AND HEATED SO AS TO PRODUCE BY SUCH REACTION A VISIBLE IMAGE CORRESPONDING TO THE UNEXPECTED AREAS OF THE RECORDING ELEMENT.
Inventors
- 👤 A Poot
- 👤 Besauw J Van
- 👤 T Ghys
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 14:13
CPC Classifications
G; G03; G03C; G03C5/00; G03C5/56; G03C1/00; G03C1/72; G03C1/73
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-05-21 | 1976-11-20 | 1977-05-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-05-21 | 1980-11-20 | 1981-05-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-05-21 | 1984-11-20 | 1985-05-22 | $7700.00 | Window Closed / Lapsed |