Patent US3576629A successfully refreshed from Google Patents.
US3576629A
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Diffusion transfer materials and process with derivatives of 4-amino-1,2,4-triazoline-5-thione as toning agents
Assignee: Mitsubishi Paper Mills Ltd
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Filing: 1968-03-11
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Granted: 1971-04-27
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Expires: 1988-03-11
Abstract
Abstract A DIFFUSION TRANSFER IMAGE HAVING DENSELY BLACK IMAGE TONE IS PRODUCED BY EFFECTING DEVELOPMENT AND DIFFUSION IN THE PRESENCE OF 4-AMINO-1,2,4-TRIAZOLINE-5-THIONE DERIVATIVES. THE EXAMPLES OF SAID DERIVATIVES ARE 4-AMINO-3ETHYL - 1,2,4- TRIAZOLINE-5-THIONE, 4-AMINO-3-PROPYL-1,2,4TRIAZOLINE-5''-THIONE, ETC.
Inventors
- 👤 Kiyoshi Futaki
- 👤 Noboru Itoh
- 👤 Sendgi Tosa
- 👤 Hirokazu Tsukahara
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-10 01:09
CPC Classifications
G; G03; G03C; G03C8/00; G03C8/24; G03C8/243; Y; Y10; Y10S; Y10S430/00; Y10S430/166
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) | 1974-04-26 | 1974-10-26 | 1975-04-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-04-26 | 1978-10-26 | 1979-04-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-04-26 | 1982-10-26 | 1983-04-27 | $7700.00 | Window Closed / Lapsed |