US4343892A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for silver recovery during photographic processing
Assignee: Fujifilm Holdings Corp
•
Filing: 1980-05-12
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Granted: 1982-08-10
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Expires: 2000-05-12
Abstract
Abstract The efficiency of silver recovery from photographic processing solutions is improved by the installation of a silver recovery water tank between the fix or blix tank and the wash water tank, which is provided with a mechanism for maintaining the silver concentration of said recovery tank at a substantially constant value, said mechanism comprising a detecting means for measuring the amount of the photographic material treated by the processing line involved and a means to supply water thereto operatable by signal from said detecting means.
Inventors
- 👤 Kazushige Uenaka
- 👤 Shinichi Kashiwagi
- 👤 Toshiro Tahara
- 👤 Kazuo Shirasu
- 👤 Yoshio Usui
- 👤 Akira Abe
- 👤 Fumio Nakagawa
- 👤 Tetsuya Masuda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 10:42
CPC Classifications
G; G03; G03D; G03D3/00; G03D3/02; G03D3/06; G03D3/065
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
99 words
A method for recovering silver from a processing fluid carried by a photographic material that has been transported through a silver-containing photographic processing fluid, wherein a silver recovery means comprising a plurality of adjacent cascade water tanks is provided between a tank for said silver-containing processing fluid and a water wash tank, and supplying water by cascade method to said silver recovery means independently of supplying water to said water wash tank based on the amount of photographic materials processed so that the amount of water supplied maintains the silver concentrations in said silver recovery water tanks substantially constant.
Claim 2
Independent Claim
99 words
A method for recovering silver from a processing fluid carried by a photographic material that has been transported through a silver-containing photographic processing fluid, wherein a silver recovery means comprising a plurality of adjacent cascade water tanks is provided between a tank for said silver-containing processing fluid and a water wash tank, and supplying water by cascade method to said silver recovery means independently of supplying water to said water wash tank based on the amount of photographic materials processed so that the amount of water supplied maintains the silver concentrations in said silver recovery water tanks substantially constant.
Claim 3
Dependent Claim
60 words
A method for recovering silver from a processing fluid carried by a photographic material by means of a silver recovery water tank as in claim 1, wherein the amount of water supplied to the silver recovery water tank is from about 2 to 10 times larger than the volume of processing fluid carried into said tank by said photographic material.
Claim 4
Dependent Claim
59 words
A method for recovering silver from a processing fluid carried by a photographic material by means of a silver recovery water tank as in claim 2, wherein the amount of water supplied to the silver recovery water tank is from 2 to 6 times larger than the amount of processing fluid carried into said tank by said photographic material.
Claim 5
Dependent Claim
51 words
A method of recovering silver from a processing fluid carried by a photographic material by means of a silver recovery water tank as in claim 1, wherein the silver level is maintained at an equilibrium concentration level in said silver recovery water tank of from about 0.5 to 3 g Ag/l.
References Cited (Backward Citations)
US720708A
Cited
US1907252A
Cited
GB1353805A
Cited
US3868253A
Cited
US3997347A
Cited
DE2920222A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-08-09 | 1986-02-08 | 1986-08-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-08-09 | 1990-02-08 | 1990-08-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-08-09 | 1994-02-08 | 1994-08-10 | $7700.00 | Window Closed / Lapsed |