Patent US3240598A successfully refreshed from Google Patents.
US3240598A
Expired / Lapsed
US
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Removal of measle spots in paper base reversal print material
Assignee: GAF Chemicals Corp
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Filing: 1961-11-30
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Granted: 1966-03-15
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Expires: 1981-11-30
Abstract
No abstract record available.
Inventors
- 👤 Carl E Johnson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 21:15
CPC Classifications
G; G03; G03C; G03C7/00; G03C7/30; G03C7/3046
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
96 words
IN THE PROCESS FOR PRODUCING REVERSAL PRINTS WHEREIN AN EXPOSED COLOR FILM COMPRISING A SILVER HALIDE EMULSION COATED ON A PAPER BASE IS TREATED WITH A FIRST DEVELOPER, GIVEN A SECOND EXPOSURE, TREATED WITH A COLOR DEVELOPER, BLEACHED AND FIXED, THE IMPROVEMENT WHICH COMPRISES TREATING SAID FILM WITH AN AQUEOUS SOLUTION OF 1 TO 5% BY WEIGHT OF A SALT SELECTED FROM THE GROUP CONSISTING OF SODIUM PERCHLORATE, POTASSIUM PERCHLORATE, SODIUM NITRATE, POTASSIUM NITRATE, SODIUM PERBORATE, POTASSIUM PERBORATE, SODIUM CHLORATE AND POTASSIUM CHLORATE AFTER SAID TREATMENT WITH SAID FIRST DEVELOPER AND BEFORE THE COLOR DEVELOPER TREATMENT.
Claim 2
Dependent Claim
96 words
IN THE PROCESS FOR PRODUCING REVERSAL PRINTS WHEREIN AN EXPOSED COLOR FILM COMPRISING A SILVER HALIDE EMULSION COATED ON A PAPER BASE IS TREATED WITH A FIRST DEVELOPER, GIVEN A SECOND EXPOSURE, TREATED WITH A COLOR DEVELOPER, BLEACHED AND FIXED, THE IMPROVEMENT WHICH COMPRISES TREATING SAID FILM WITH AN AQUEOUS SOLUTION OF 1 TO 5% BY WEIGHT OF A SALT SELECTED FROM THE GROUP CONSISTING OF SODIUM PERCHLORATE, POTASSIUM PERCHLORATE, SODIUM NITRATE, POTASSIUM NITRATE, SODIUM PERBORATE, POTASSIUM PERBORATE, SODIUM CHLORATE AND POTASSIUM CHLORATE AFTER SAID TREATMENT WITH SAID FIRST DEVELOPER AND BEFORE THE COLOR DEVELOPER TREATMENT.
References Cited (Backward Citations)
US2393027A
Cited
GB802275A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-03-14 | 1969-09-13 | 1970-03-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-03-14 | 1973-09-13 | 1974-03-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-03-14 | 1977-09-13 | 1978-03-15 | $7700.00 | Window Closed / Lapsed |