Patents Assigned to TMC Corp.
  • Method for treating, spent dryfilm stripping and developing solutions
    Patent number: 4857206
    Abstract: A method of treating spent dryfilm stripper and developer solutions by mixing the spent solutions with a solution of aluminum sulfate and borax in controlled amounts causing a reaction which results in a slurry of a non-sticky, benign precipitate in a supernatant liquid. The supernatant liquid contains the dissolved heavy metals. The non-sticky precipitate does not interfere with the ph measurement which indicates when the reaction is complete, and the benign precipitate can be fillered out for disposal.
    Type: Grant
    Filed: November 2, 1987
    Date of Patent: August 15, 1989
    Assignee: TMC Corp.
    Inventor: Tat Y. Choo