US2944897A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Reversal film method
Assignee: Individual
•
Filing: 1956-12-12
•
Granted: 1960-07-12
•
Expires: 1976-12-12
Abstract
No abstract record available.
Inventors
- 👤 Newman S Shirk
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:48
CPC Classifications
G; G03; G03C; G03C5/00; G03C5/26; G03C5/50; G03C1/00; G03C1/005; G03C1/49; Y; Y10; Y10S; Y10S430/00; Y10S430/15
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
162 words
IN THE TREATMENT OF PHOTOGRAPHIC FILM, THE METHOD COMPRISING THE STEPS OF: (A) BEGINNING WITH A MANUFACTURED HIGH-CONTRAST GRAINLESS FILM OF A SILVER-BROMIDE EMULSION ON AN ACETATE BASE AS THE STARTING POINT OF THE METHOD, (B) PREFOGGING SAID FILM BY EXPOSING IT TO LIGHT FOR A PREDETERMINED PERIOD, (C) IMMERSING THE PREFOGGED FILM IN A SOLARIZING BATH, THE BATH BEING AN AQUEOUS SOLUTION OF A COMPOUND TAKEN FROM THE GROUP CONSISTING OF: SODIUM CHLORIDE, CALCIUM CHLORIDE, POTASSIUM BROMIDE, SODIUM HYPOCHLORITE, LEAD NITRATE, POTASSIUM NITRATE, COPPER NITRATE, COPPER SULFATE, ALUMINUM SULFATE, FERRIC SULFATE, MANGANESE SULFATE, MAGNESIUM SULFATE, ZINC SULFATE, URANIUM NITRATE, POTASSIUM CARBONATE, SODIUM CARBONATE, POTASSIUM BICHROMATE, ROCHELLE SALTS, ACETIC ACID, HYDROCHLORIC ACID, NITRIC ACID, AQUA REGIA, POTASSIUM HYDROXIDE, SODIUM HYDROXIDE, AMMONIUM HYDROXIDE, AND HYDROGEN PEROXIDE, (D) WASHING THE FILM IN CLEAR WATER, (E) DRYING THE WASHED FILM, (F) EXPOSING A GIVEN AREA OF SAID FILM TO CREATE AN IMAGE THEREON THAT IS VISIBLE PRIOR TO DEVELOPMENT, AND (G) THEN DEVELOPING SAID FILM.
Claim 2
Dependent Claim
162 words
IN THE TREATMENT OF PHOTOGRAPHIC FILM, THE METHOD COMPRISING THE STEPS OF: (A) BEGINNING WITH A MANUFACTURED HIGH-CONTRAST GRAINLESS FILM OF A SILVER-BROMIDE EMULSION ON AN ACETATE BASE AS THE STARTING POINT OF THE METHOD, (B) PREFOGGING SAID FILM BY EXPOSING IT TO LIGHT FOR A PREDETERMINED PERIOD, (C) IMMERSING THE PREFOGGED FILM IN A SOLARIZING BATH, THE BATH BEING AN AQUEOUS SOLUTION OF A COMPOUND TAKEN FROM THE GROUP CONSISTING OF: SODIUM CHLORIDE, CALCIUM CHLORIDE, POTASSIUM BROMIDE, SODIUM HYPOCHLORITE, LEAD NITRATE, POTASSIUM NITRATE, COPPER NITRATE, COPPER SULFATE, ALUMINUM SULFATE, FERRIC SULFATE, MANGANESE SULFATE, MAGNESIUM SULFATE, ZINC SULFATE, URANIUM NITRATE, POTASSIUM CARBONATE, SODIUM CARBONATE, POTASSIUM BICHROMATE, ROCHELLE SALTS, ACETIC ACID, HYDROCHLORIC ACID, NITRIC ACID, AQUA REGIA, POTASSIUM HYDROXIDE, SODIUM HYDROXIDE, AMMONIUM HYDROXIDE, AND HYDROGEN PEROXIDE, (D) WASHING THE FILM IN CLEAR WATER, (E) DRYING THE WASHED FILM, (F) EXPOSING A GIVEN AREA OF SAID FILM TO CREATE AN IMAGE THEREON THAT IS VISIBLE PRIOR TO DEVELOPMENT, AND (G) THEN DEVELOPING SAID FILM.
References Cited (Backward Citations)
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Cited
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Cited
US2005837A
Cited
US1966332A
Cited
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Cited
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-07-12 | 1964-01-11 | 1964-07-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-07-12 | 1968-01-11 | 1968-07-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-07-12 | 1972-01-11 | 1972-07-12 | $7700.00 | Window Closed / Lapsed |