US3764337A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Color photographic materials containing dihydroxyspirochroman compounds as stabilizers
Assignee: Fujifilm Holdings Corp
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Filing: 1971-12-29
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Granted: 1973-10-09
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Expires: 1991-12-29
Abstract
Abstract COLOR PHOTOGRAPHIC MATERIALS CONTAINING AS STABILIZERS COMPOUNDS REPRESENTED BY THE FORMULA I 4,4,4'',4''-TETRA(CH3-),6,6''-DI(HO-),7,7''-DI(R1-),8,8''- DI(R2-)-3,4,3'',4''-TETRAHYDRO-2,2''-SPIROBI(2H-1-BENZOPYRAN) WHEREIN R1 IS AN ALKYL GROUP HAVING 18 OR LESS CARBON ATOMS, AN ALKENYL GROUP, AN ARYL GROUP, AN ALKOXY GROUP, AN ALKENOXY GROUP, AN ARYLOXY GROUP, AN ACYLAMINOALKYL GROUP OR AN ACYLAMINOARALKYL GROUP, AND R2 IS A HYDROGEN ATOM, A HALOGEN ATOM, AN ALKYL GROUP, AN ALKENYL GROUP OR AN ALKOXY GROUP.
Inventors
- 👤 A Arai
- 👤 Y Oishi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 17:22
CPC Classifications
C; C07; C07D; C07D493/00; C07D493/02; C07D493/10; G; G03; G03C; G03C1/00; G03C1/76; G03C1/795; G03C1/7954; G03C1/815; G03C1/8155; G03C7/00; G03C7/30; G03C7/392; G03C7/39208; G03C7/3928
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) | 1976-10-08 | 1977-04-09 | 1977-10-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-08 | 1981-04-09 | 1981-10-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-08 | 1985-04-09 | 1985-10-09 | $7700.00 | Window Closed / Lapsed |