Patent US3294536A successfully refreshed from Google Patents.
US3294536A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photographic prehardener compositions
Assignee: Eastman Kodak Co
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Filing: 1963-11-04
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Granted: 1966-12-27
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Expires: 1983-11-04
Abstract
No abstract record available.
Inventors
- 👤 Harry C Baden
- 👤 Charleton C Bard
- 👤 Seemann James Marvin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 03:38
CPC Classifications
G; G03; G03C; G03C5/00; G03C5/26; G03C5/268
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
77 words
A COMPOSITION WHICH IN AQUEOUS SOLUTION AT A PH WITHIN THE RANGE OF 2-10 IS USEFUL AS A PREHARDENER COMPOSED OF THE FOLLOWING: A SUCCINALDEHYDE SUPPLYING COMPOUND SELECTED FROM THE GROUP CONSISTING OF SUCCINALDEHYDE, 2,5-DIMETHOXYTETRAHYDROFURAN AND 2,5-DIETHOXYTETRAHYDROFURAN, FORMALDEHYDE, ALKALI METAL SULFATE, ALKALI METAL BROMIDE AND A COMPOUND SELECTED FROM THE GROUP CONSISTING OF DIOXAN, ASCORBIC ACID, ACETYL ACETONE, THE C0-C15 ALPHATIC ALCOHOLS, THE AROMATIC SULFINIC ACIDS, KOJIC ACID, AND THE AMINO ALPHATIC ACIDS OF 2-4 CARBON ATOMS.
Claim 2
Dependent Claim
77 words
A COMPOSITION WHICH IN AQUEOUS SOLUTION AT A PH WITHIN THE RANGE OF 2-10 IS USEFUL AS A PREHARDENER COMPOSED OF THE FOLLOWING: A SUCCINALDEHYDE SUPPLYING COMPOUND SELECTED FROM THE GROUP CONSISTING OF SUCCINALDEHYDE, 2,5-DIMETHOXYTETRAHYDROFURAN AND 2,5-DIETHOXYTETRAHYDROFURAN, FORMALDEHYDE, ALKALI METAL SULFATE, ALKALI METAL BROMIDE AND A COMPOUND SELECTED FROM THE GROUP CONSISTING OF DIOXAN, ASCORBIC ACID, ACETYL ACETONE, THE C0-C15 ALPHATIC ALCOHOLS, THE AROMATIC SULFINIC ACIDS, KOJIC ACID, AND THE AMINO ALPHATIC ACIDS OF 2-4 CARBON ATOMS.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-12-26 | 1970-06-27 | 1970-12-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-12-26 | 1974-06-27 | 1974-12-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-12-26 | 1978-06-27 | 1978-12-27 | $7700.00 | Window Closed / Lapsed |