Patents by Inventor John H. Andros

John H. Andros 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).

  • Patent number: 4435305
    Abstract: A non-aqueous liquid chemical formulation for reclaiming silk screens by removing simultaneously the stencil emulsion and ink is described. The silk screen is contacted with the liquid for a period sufficient to loosen the hardened stencil emulsion and the ink from the surface of the silk screen. The non-aqueous liquid chemical formulation is typically placed in a carbon steel tank at ambient temperature and the silk screen is immersed in the liquid for approximately five minutes. Alternately, the silk screen can be sprayed with the liquid formulation and allowed to soak for approximately seven minutes. The softened ink and stencil emulsion are then removed by using a high pressure water jet stream. The formulation contains an alkali metal hydroxide, a monohydric or polyhydric alcohol, a glycol ether, a surfactant, aliphatic and/or aromatic hydrocarbons and a wax.
    Type: Grant
    Filed: January 24, 1983
    Date of Patent: March 6, 1984
    Inventors: Skevos N. Tsoukalas, John H. Andros