US2671022A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyvinyl alcohol gels and photographic silver halide emulsions containing berylliumcompounds
Assignee: GAF Chemicals Corp
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Filing: 1949-06-24
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Granted: 1954-03-02
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Expires: 1969-06-24
Abstract
No abstract record available.
Inventors
- 👤 Donald E Sargent
- 👤 Jr John C Bailar
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 07:33
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/005; G03C1/04; G03C1/053; G03C1/06; G03C1/08
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
39 words
THE METHOD OF PREPARING A TOUGH, COLORLESS GEL WHICH COMPRISES MIXING AN AQUEOUS SOLUTION OF POLYVINYL ALCOHOL WITH A WATER SOLUBLE INORGANIC BERYLLIUM SALT IN A GELLING AMOUNT AND TREATING THE MIXTURE WITH A WATER SOLUBLE INORGANIC BASIC MATERIAL.
Claim 2
Independent Claim
39 words
THE METHOD OF PREPARING A TOUGH, COLORLESS GEL WHICH COMPRISES MIXING AN AQUEOUS SOLUTION OF POLYVINYL ALCOHOL WITH A WATER SOLUBLE INORGANIC BERYLLIUM SALT IN A GELLING AMOUNT AND TREATING THE MIXTURE WITH A WATER SOLUBLE INORGANIC BASIC MATERIAL.
Claim 3
Dependent Claim
67 words
THE PROCESS OF PRODUCING A LIGHT SENSITIVE PHOTOGRAPHIC ELEMENT COMPRISING A SILVER HALIDE UNIFORMLY DISPERSED IN A TOUGH, COLORLESS GEL OF POLYVINYL ALCOHOL WHICH COMPRISES ADDING TO AN AQUEOUS SOLUTION OF POLYVINYL ALCOHOL, AN ALKALI METAL HALIDE, ADDING SILVER NITRATE WHILE CONTINUOUSLY STIRRING THE MASS, INCORPORATING A WATER SOLUBLE INORGANIC BERYLLIUM SALT IN A GELLING AMOUNT, COATING THE COMPOSITION ON A SUPPORT AND TREATING IT WITH AMMONIA.
Claim 4
Dependent Claim
67 words
THE PROCESS OF PRODUCING A LIGHT SENSITIVE PHOTOGRAPHIC ELEMENT COMPRISING A SILVER HALIDE UNIFORMLY DISPERSED IN A TOUGH, COLORLESS GEL OF POLYVINYL ALCOHOL WHICH COMPRISES ADDING TO AN AQUEOUS SOLUTION OF POLYVINYL ALCOHOL, AN ALKALI METAL HALIDE, ADDING SILVER NITRATE WHILE CONTINUOUSLY STIRRING THE MASS, INCORPORATING A WATER SOLUBLE INORGANIC BERYLLIUM SALT IN A GELLING AMOUNT, COATING THE COMPOSITION ON A SUPPORT AND TREATING IT WITH AMMONIA.
References Cited (Backward Citations)
US2412200A
Cited
US2439108A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-03-01 | 1957-08-31 | 1958-03-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-03-01 | 1961-08-31 | 1962-03-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-03-01 | 1965-08-31 | 1966-03-02 | $7700.00 | Window Closed / Lapsed |