US3947168A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Film casting apparatus for the purification of photographic materials
Assignee: Fujifilm Holdings Corp
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Filing: 1970-07-27
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Granted: 1976-03-30
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Expires: 1990-07-27
Abstract
Abstract A process for effectively and rapidly desalting gelatino silver halide emulsions for photographic light sensitive elements wherein a thin film of the emulsion is formed and gelled by cooling and thereafter washed with cold water.
Inventors
- 👤 Motohiro Ujihara
- 👤 Itsuo Fujii
- 👤 Yasunori Nagai
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 12:27
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/005; G03C1/015; B; B29; B29C; B29C48/00; B29C48/03; B29C48/07; B29C48/08; B29C48/25; B29C48/88; B29C48/911; B29C48/9135; B29C48/914; G03C2200/00; G03C2200/09
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
138 words
A desalting apparatus for desalting a photographic emulsion consisting of a rotatable drum having a flat cooling surface, a cooling bath containing cold water and means to flow said cold water through said cooling bath, the lower section of said rotatable drum being immersed in said cold water, a hopper for supplying the photographic emulsion to said flat surface to form thereon a thin film of said photographic emulsion having a thickness of from 30 to 300 microns and scraper means for scraping the gelled and desalted film of the photographic emulsion from said flat surface after passage through said cold water bath, said scraper means consisting of a flexible plastic sheet, and wherein said apparatus further consists of a water supply member disposed above said scraper means to supply fresh water to the end of said scraper.
Claim 2
Dependent Claim
138 words
A desalting apparatus for desalting a photographic emulsion consisting of a rotatable drum having a flat cooling surface, a cooling bath containing cold water and means to flow said cold water through said cooling bath, the lower section of said rotatable drum being immersed in said cold water, a hopper for supplying the photographic emulsion to said flat surface to form thereon a thin film of said photographic emulsion having a thickness of from 30 to 300 microns and scraper means for scraping the gelled and desalted film of the photographic emulsion from said flat surface after passage through said cold water bath, said scraper means consisting of a flexible plastic sheet, and wherein said apparatus further consists of a water supply member disposed above said scraper means to supply fresh water to the end of said scraper.
References Cited (Backward Citations)
US1529813A
Cited
US2534629A
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US2624913A
Cited
US2798004A
Cited
US3396027A
Cited
US3429957A
Cited
US3539426A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-03-30 | 1979-09-29 | 1980-03-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-03-30 | 1983-09-29 | 1984-03-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-03-30 | 1987-09-29 | 1988-03-30 | $7700.00 | Window Closed / Lapsed |