US2784086A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Concentrated developers
Assignee: Eastman Kodak Co
•
Filing: 1953-07-28
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Granted: 1957-03-05
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Expires: 1973-07-28
Abstract
No abstract record available.
Inventors
- 👤 Richard W Henn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 09:14
CPC Classifications
G; G03; G03C; G03C5/00; G03C5/26; G03C5/264; G03C5/266; Y; Y10; Y10S; Y10S430/00; Y10S430/167
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
62 words
A PHOTOGRAPHIC DEVELOPER COMPRISING A SILVER HALIDE DEVELOPER AND AN ALKALI BOTH OF WHICH ARE IN FINELY GROUND SOLID FORM SUSPENDED AS A THICK PASTE IN A COLLOIDAL GEL CONSISTING OF A COMPOUND SELECTED FROM THE GROUP CONSISTING OF ALGINIC ACID, A SALT OF ALGINIC ACID, AND AN ESTER OF ALGINIC ACID, AND COMPOUND BEING IN 1/2% TO 10% CONCENTRATION IN WATER.
Claim 2
Dependent Claim
62 words
A PHOTOGRAPHIC DEVELOPER COMPRISING A SILVER HALIDE DEVELOPER AND AN ALKALI BOTH OF WHICH ARE IN FINELY GROUND SOLID FORM SUSPENDED AS A THICK PASTE IN A COLLOIDAL GEL CONSISTING OF A COMPOUND SELECTED FROM THE GROUP CONSISTING OF ALGINIC ACID, A SALT OF ALGINIC ACID, AND AN ESTER OF ALGINIC ACID, AND COMPOUND BEING IN 1/2% TO 10% CONCENTRATION IN WATER.
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) | 1960-03-04 | 1960-09-03 | 1961-03-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-03-04 | 1964-09-03 | 1965-03-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-03-04 | 1968-09-03 | 1969-03-05 | $7700.00 | Window Closed / Lapsed |