US2816026A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stabilizing agents for single powder photographic developers
Assignee: Eastman Kodak Co
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Filing: 1954-11-26
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Granted: 1957-12-10
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Expires: 1974-11-26
Abstract
No abstract record available.
Inventors
- 👤 Ralph W Baxendale
- 👤 Arthur A Rasch
- 👤 John I Crabtree
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 10:47
CPC Classifications
G; G03; G03C; G03C5/00; G03C5/26; G03C5/264; G03C5/265
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
38 words
A STABLE SINGLE-POWDER PHOTOGRAPHIC DEVELOPER COMPOSITION CONTAINING AN ORGANIC SILVER HALIDE DEVELOPER, AN ALKALI BORATE, AN ALKALI SULFITE, AN ALKALI HYDROXIDE, AND A STABILIZING AGENT SELECTED FROM TEH GROUP CONSISTING OF BORO-ACETIC ANHYDRIDE, BORO-BENZOIC ANHYDRIDE AND BOROPHTHALIC ANHYDRIDE.
Claim 2
Dependent Claim
38 words
A STABLE SINGLE-POWDER PHOTOGRAPHIC DEVELOPER COMPOSITION CONTAINING AN ORGANIC SILVER HALIDE DEVELOPER, AN ALKALI BORATE, AN ALKALI SULFITE, AN ALKALI HYDROXIDE, AND A STABILIZING AGENT SELECTED FROM TEH GROUP CONSISTING OF BORO-ACETIC ANHYDRIDE, BORO-BENZOIC ANHYDRIDE AND BOROPHTHALIC ANHYDRIDE.
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) | 1960-12-09 | 1961-06-10 | 1961-12-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-12-09 | 1965-06-10 | 1965-12-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-12-09 | 1969-06-10 | 1969-12-10 | $7700.00 | Window Closed / Lapsed |