Patents by Inventor Osten Lindgren

Osten Lindgren has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Apparatus for recovery of re-usable substances from a fixing bath in processes for development and fixing of photographic films and X-ray films
    Patent number: 4108753
    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.
    Type: Grant
    Filed: May 6, 1977
    Date of Patent: August 22, 1978
    Assignee: AB Metall & Bergprodukter
    Inventor: Osten Lindgren
  • Process for recovery of re-usable substances from a fixing bath in processes for development and fixing of photographic films and X-ray films
    Patent number: 4042473
    Abstract: Apparatus and a process for electroylic recovery of silver from fixing 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.
    Type: Grant
    Filed: November 17, 1975
    Date of Patent: August 16, 1977
    Assignee: AB Metall- & Bergprodukter
    Inventor: Osten Lindgren