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US4108753A Expired / Lapsed US ⏱️ 0.0 years remaining

Apparatus for recovery of re-usable substances from a fixing bath in processes for development and fixing of photographic films and X-ray films

Assignee: Metall and Bergprodukter AB
•
Filing: 1977-05-06
•
Granted: 1978-08-22
•
Expires: 1997-05-06
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Abstract

Abstract Apparatus and a process for electroylic recovery of silver from fixng baths obtained by development of photographic films wherein the fixing bath solution coming from the tank for the fixing bath to the development apparatus is fed from the development apparatus into one chamber in a recovery apparatus comprising two chambers until the said first chamber is filled whereupon the silver precipitation is started in the said chamber; an automatic redirection of the liquid flow from the development apparatus to the second chamber of the recovery apparatus is made to the said second chamber which being filled with liquid during the precipitation process in the first chamber. After concluded silver precipitation in the first chamber the liquid treated therein is automatically fed to the sewage. When the second chamber has been filled the precipitation process in the same is started. Simultaneously the liquid flow from the development apparatus is automatically fed to the first chamber which now is empty. When the precipitation process in the second chamber is finished the liquid is pumped through a filter -- i.e. for removal of gelatine, silver bromide, etc. -- from the second chamber back to the chemicals tank for re-use, whereupon the cycle is repeated.

Inventors

  • 👤 Osten Lindgren

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-23 11:06
CPC Classifications
C; C25; C25C; C25C7/00; C25C7/06; C02; C02F; C02F1/00; C02F1/46; C02F1/461; C02F1/46104; C02F1/58; C02F1/62; C25C1/00; C25C1/20; C02F2101/00; C02F2101/10; C02F2101/20; C02F2103/00; C02F2103/34; C02F2103/40; C02F2201/00; C02F2201/46; C02F2201/461; C02F2201/46105; C02F2201/4612; C02F2201/46145; C02F2201/4615; C02F2209/00; C02F2209/005; C02F2209/42; C02F2303/00; C02F2303/16

Claims Analysis

Total Claims: 6
Claim 1
Independent Claim 137 words
Recovery apparatus for the electrolytic recovery of silver from fixing bath solutions obtained by development of photographic films and X-ray films comprising: a tank connected to the development fixing bath, said tank containing the anodes and cathodes for the electrolytic process, and being subdivided into first and second chambers by a separating wall; and a flow guiding device disposed above said separating wall and by means of a rocker and floaters operative to automatically guide the solution flowing from the development fixing baths to the first chamber until this chamber is filled, whereupon silver precipitation is started in this chamber, and to the second chamber which is filled with liquid during the precipitation process in the first chamber, respectively, of which chamber one is connected to sewage and chamber two is connected to a recovery chemicals tank.
Claim 2
Dependent Claim 137 words
Recovery apparatus for the electrolytic recovery of silver from fixing bath solutions obtained by development of photographic films and X-ray films comprising: a tank connected to the development fixing bath, said tank containing the anodes and cathodes for the electrolytic process, and being subdivided into first and second chambers by a separating wall; and a flow guiding device disposed above said separating wall and by means of a rocker and floaters operative to automatically guide the solution flowing from the development fixing baths to the first chamber until this chamber is filled, whereupon silver precipitation is started in this chamber, and to the second chamber which is filled with liquid during the precipitation process in the first chamber, respectively, of which chamber one is connected to sewage and chamber two is connected to a recovery chemicals tank.
Claim 3
Dependent Claim 42 words
Recovery apparatus as in claim 1 including an electronic programme circuit means for controlling the operation of the recovery apparatus, said programme circuit means including relays for automatically controlling pumps interconnecting the tank to the sewage and to the recovery chemicals tank.
Claim 4
Dependent Claim 92 words
Recovery apparatus as in claim 1 wherein the flow guiding device is provided with first and second floaters for respectively sensing the levels of the solutions in the first and second chambers for guiding the solution flow of the fixing bath from the development apparatus to the one empty chamber for filling it and after sensing this state and after the start of the silver precipitation in this filled chamber guiding the solution flow to the other chamber for filling this empty chamber during the precipitation process in the first named chamber.
Claim 5
Dependent Claim 109 words
Recovery apparatus according to claim 1 wherein said flow guiding device includes a hinged flow tube located centrally above the separating wall between the two chambers of the tank, and forked tubes directed towards each one of the chambers, each one of said forked tubes having the shape of a T being provided with a floater attached to the end of the one branch reaching down into the chamber located below and interacting with this forked tube to tilt it and to cause flow first to the one chamber and then to the other, and provided with an upwardly directed and upwards open tube connection coaxially with the floater.
Claim 6
Dependent Claim 28 words
Recovery apparatus according to claim 4 wherein the central hinged flow tube is connected to the connection from the development fixing bath by means of an elastic tube.

References Cited (Backward Citations)

US3274094A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1981-08-21 1982-02-20 1982-08-22 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1985-08-21 1986-02-20 1986-08-22 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1989-08-21 1990-02-20 1990-08-22 $7700.00 Window Closed / Lapsed

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