Patents by Inventor David L. Czirr

David L. Czirr 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).

  • Nitric acid system for etching magnesium plates
    Patent number: 4032379
    Abstract: A one-step powderless high-speed process for producing photoengraved letter-press printing and pattern plates from magnesium and alloys thereof by etching such plates in a machine that directs against a surface of the plate droplets of an etching liquid comprising an aqueous solution of a strong inorganic acid and adjuvants.
    Type: Grant
    Filed: October 31, 1975
    Date of Patent: June 28, 1977
    Assignee: Philip A. Hunt Chemical Corporation
    Inventors: David L. Czirr, Harry Kroll
  • Nitric acid system for etching magnesium plates
    Patent number: 3935118
    Abstract: A one-step powderless high-speed process for producing photoengraved letter-press printing and pattern plates from magnesium and alloys thereof by etching such plates in a machine that directs against a surface of the plate droplets of an etching liquid comprising an aqueous solution of a strong inorganic acid and adjuvants.
    Type: Grant
    Filed: February 11, 1974
    Date of Patent: January 27, 1976
    Assignee: Philip A. Hunt Chemical Corporation
    Inventors: David L. Czirr, Harry Kroll