Patent US3563755A successfully refreshed from Google Patents.
US3563755A
Expired / Lapsed
US
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Tetraazaindene-stabilized photographic emulsions
Assignee: 3M Co
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Filing: 1967-12-05
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Granted: 1971-02-16
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Expires: 1987-12-05
Abstract
Abstract TETRAAZAINDENE COMPOUNDS HAVING THE FORMULA 2-Y,5-R,6-(R''-N(-R")-CH2-),7-HO-S-TRIAZOLO(1,5-A)- PYRIMIDINE IN WHICH R REPRESENTS A HYDROGEN ATOM, AN ALKYL GROUP OR AN ALKYLTHIO GROUP, R'' AND R" INDIVIDUALLY REPRESENT A HYDROGEN ATOM, A LOWER ALKYL GROUP OR TOGETHER FORM A 5 OR 6 MEMBERED HETEROCYCLIC RING, Y REPRESENTS A HYDROGEN ATOM OR AN ALKYL, ALKYLTHIO, ARYL OR AMINE GROUP; AND THE SALTS THEREOF. THIS INVENTION ALSO DESCRIBED THE PREPARATION OF THE ABOVEMENT COMPOUNDS AND THEIR USE IN PHOTOGRAPHIC EMULSIONS.
Inventors
- 👤 George De W Anderson
- 👤 Ronald E Watts
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 17:04
CPC Classifications
C; C07; C07D; C07D487/00; C07D487/02; C07D487/04; G; G03; G03C; G03C1/00; G03C1/005; G03C1/06; G03C1/34
Claims Analysis
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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) | 1974-02-15 | 1974-08-17 | 1975-02-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-15 | 1978-08-17 | 1979-02-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-15 | 1982-08-17 | 1983-02-16 | $7700.00 | Window Closed / Lapsed |