US3201246A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photographic developers containing calcium precipitation inhibitors
Assignee: Eastman Kodak Co
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Filing: 1961-04-10
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Granted: 1965-08-17
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Expires: 1981-04-10
Abstract
No abstract record available.
Inventors
- 👤 Charles F H Allen
- 👤 John A Ford
- 👤 Richard W Henn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 00:00
CPC Classifications
G; G03; G03C; G03C5/00; G03C5/26; G03C5/264; G03C5/265; G03C5/29; G03C5/305; G03C5/3053
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
55 words
A PHOTOGRAPHIC DEVELOPER COMPRISING AN AQUEOUS ALKALINE SOLUTION OF A DEVELOPING AGENT FOR PHOTOEXPOSED SILVER HALIDE AND A WATER-SOLUBLE SALT OF AN ACID SELECTED FROM THE CLASS CONSISTING OF ETHYLENEDIAMINE-N,N,N'',N''TETRAMETHYLENEPHOSPHONIC ACID, NITRILO-N,N,N-TRIMETHYLENEPHOSPHONIC ACID, 1,2-CYCLOHEXANEDIAMINE-N,N,N'',N''TETRAMETHYLENEPHOSPHONIC ACID, O-CARBOXYANILINO-N,NDIMETHYLENEPHOSPHONIC ACID, 1,3-DIAMINOPROPANOL-N,N, N'',N''-TETRAMETHYLENEPHOSPHONIC ACID, 1,3-PROPANEDIAMINE-N,N,N'',N''-TETRAMETHYLENEPHOSPHONIC ACID, 1,6-HEXANEDIAMINE-N,N,N'',N''-TETRAMETHYLENEPHOSPHONIC ACID, 2-PYRIDYLAMINO-N'',N''-DIMETHYLENEPHOSPHONIC ACID AND A COMPOUND REPRESENTED BY THE FOLLOWING GENERAL FORMULA:
Claim 2
Dependent Claim
55 words
A PHOTOGRAPHIC DEVELOPER COMPRISING AN AQUEOUS ALKALINE SOLUTION OF A DEVELOPING AGENT FOR PHOTOEXPOSED SILVER HALIDE AND A WATER-SOLUBLE SALT OF AN ACID SELECTED FROM THE CLASS CONSISTING OF ETHYLENEDIAMINE-N,N,N'',N''TETRAMETHYLENEPHOSPHONIC ACID, NITRILO-N,N,N-TRIMETHYLENEPHOSPHONIC ACID, 1,2-CYCLOHEXANEDIAMINE-N,N,N'',N''TETRAMETHYLENEPHOSPHONIC ACID, O-CARBOXYANILINO-N,NDIMETHYLENEPHOSPHONIC ACID, 1,3-DIAMINOPROPANOL-N,N, N'',N''-TETRAMETHYLENEPHOSPHONIC ACID, 1,3-PROPANEDIAMINE-N,N,N'',N''-TETRAMETHYLENEPHOSPHONIC ACID, 1,6-HEXANEDIAMINE-N,N,N'',N''-TETRAMETHYLENEPHOSPHONIC ACID, 2-PYRIDYLAMINO-N'',N''-DIMETHYLENEPHOSPHONIC ACID AND A COMPOUND REPRESENTED BY THE FOLLOWING GENERAL FORMULA:
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) | 1968-08-16 | 1969-02-15 | 1969-08-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-08-16 | 1973-02-15 | 1973-08-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-08-16 | 1977-02-15 | 1977-08-17 | $7700.00 | Window Closed / Lapsed |