US3660093A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dry azido thermal diffusion copying process
Assignee: Agfa Gevaert AG
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Filing: 1969-07-02
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Granted: 1972-05-02
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Expires: 1989-07-02
Abstract
Abstract Positive copies are produced by a dry heat transfer process, whereby an imagewise exposed light-sensitive layer containing an organic azido compound is heated to transfer the azido compound from the unexposed areas to a reception layer and subsequent reaction to a visible positive image.
Inventors
- 👤 Erwin Ranz
- 👤 Helmut Kampfer
- 👤 Harald Von Rintelen
- 👤 Heinz-Dieter Schutz
- 👤 Dietmar Mayer
- 👤 Klaus Sasse
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 11:55
CPC Classifications
G; G03; G03C; G03C8/00; G03C8/40; G03C1/00; G03C1/695
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
35 words
The process of claim 1, wherein X and Y stands for the ring members necessary for completing one of the following rings: thioxanthene-S-dioxide, rhodanine, thiohydantoin, thiobarbituric aicd, barbituric acid, pyrazoline, 5-iminopyrazoline, pyrazolidinedione-3,5 or thiooxazolidine dione.
References Cited (Backward Citations)
US1845989A
Cited
GB727676A
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US2747999A
Cited
US3007795A
Cited
US2882151A
Cited
US3282693A
Cited
US3062650A
Cited
US3143423A
Cited
US3519424A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-05-02 | 1975-11-01 | 1976-05-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-02 | 1979-11-01 | 1980-05-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-02 | 1983-11-01 | 1984-05-02 | $7700.00 | Window Closed / Lapsed |