US2607686A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of obtaining cold sepia tones
Assignee: GAF Chemicals Corp
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Filing: 1949-10-18
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Granted: 1952-08-19
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Expires: 1969-10-18
Abstract
No abstract record available.
Inventors
- 👤 Ira B Current
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 19:38
CPC Classifications
G; G03; G03C; G03C5/00; G03C5/26; G03C5/40; G03C5/46
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
81 words
A PROCESS OF OBTAINING COLD SEPIA TONES BY TONING WARM TONED POSITIVE PRINTING PAPERS OF THE GROUP CONSISTING OF CHLORIDE AND CHLORO-BROMIDE PAPERS WHICH CONSISTS OF EXPOSING AND DEVELOPING SAID PAPERS WITH A PHOTOGRAHIC DEVELOPER FOR POSITIVE SILVER HALIDE EMULSIONS COMPRISING AN AROMATIC SILVER HALIDE DEVELOPING AGENT AND FROM 20 TO 80 GRAMS OF POTASSIUM BROMIDE PER LITER, FIXING AND WASHING THE DEVELOPED PRINT, AND SUBSEQUENTLY TONING IT WITH A TONER SELECTED FROM THE GROUP CONSISTING OF SULFUR AND SELENIUM TONERS.
Claim 2
Dependent Claim
81 words
A PROCESS OF OBTAINING COLD SEPIA TONES BY TONING WARM TONED POSITIVE PRINTING PAPERS OF THE GROUP CONSISTING OF CHLORIDE AND CHLORO-BROMIDE PAPERS WHICH CONSISTS OF EXPOSING AND DEVELOPING SAID PAPERS WITH A PHOTOGRAHIC DEVELOPER FOR POSITIVE SILVER HALIDE EMULSIONS COMPRISING AN AROMATIC SILVER HALIDE DEVELOPING AGENT AND FROM 20 TO 80 GRAMS OF POTASSIUM BROMIDE PER LITER, FIXING AND WASHING THE DEVELOPED PRINT, AND SUBSEQUENTLY TONING IT WITH A TONER SELECTED FROM THE GROUP CONSISTING OF SULFUR AND SELENIUM TONERS.
References Cited (Backward Citations)
US2366496A
Cited
US2415666A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-08-19 | 1956-02-18 | 1956-08-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-08-19 | 1960-02-18 | 1960-08-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-08-19 | 1964-02-18 | 1964-08-19 | $7700.00 | Window Closed / Lapsed |