Patent US2843484A successfully refreshed from Google Patents.
US2843484A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Alkalies for single powder photographic developers
Assignee: Eastman Kodak Co
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Filing: 1956-07-18
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Granted: 1958-07-15
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Expires: 1976-07-18
Abstract
No abstract record available.
Inventors
- 👤 Ralph W Baxendale
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 07:33
CPC Classifications
G; G03; G03C; G03C5/00; G03C5/26; G03C5/264; G03C5/265
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
75 words
A STABLE SINGLE POWDER PHOTOGRAPHIC DEVELOPER COMPOSITION WHICH RESISTS DETERIORATION WHEN HEATED TO 120* F. CONTAINING AN ORGANIC SILVER HALIDE DEVELOPER, A BASIC INGREDIENT SELECTED FROM THE GROUP CONSISTING OF ALKALI BORATES AND SULFITES AND AN ALKALI HYDROXIDE SELECTED FROM THE GROUP CONSISTING OF SODIUM AND POTASSIUM HYDROXIDE HAVING A PROTECTIVE COATING THEREON OF THE REACTION PRODUCT OF THE SELECTED ALKALI HYDROXIDE AND AN AMIDE SELECTED FROM THE GROUP CONSISTING OF UREA, FORMAMIDE AND PHTHALAMIDE.
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) | 1961-07-14 | 1962-01-13 | 1962-07-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-07-14 | 1966-01-13 | 1966-07-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-07-14 | 1970-01-13 | 1970-07-15 | $7700.00 | Window Closed / Lapsed |