Patents by Inventor Donald J. Riley

Donald J. Riley 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).

  • Method of electrolytically graining a lithographic plate
    Patent number: 4548683
    Abstract: A method is provided for electrolytically graining an aluminum lithographic plate to produce a grained surface with a honeycomb topography, non-directional grain structure, and a substantially reduced production of smut. The reduction of smut is achieved by utilizing an alternating current of higher frequencies, generally in the range of approximately 140 to 400 Hz.
    Type: Grant
    Filed: September 28, 1984
    Date of Patent: October 22, 1985
    Assignee: Polychrome Corp.
    Inventors: Jen-chi Huang, Gregory Von Gruenberg, Donald J. Riley
  • Electrolytic graining
    Patent number: 4545875
    Abstract: The invention features an electrolytic process for producing lithographic plates. The plates are immersed in a bath and fed a shaped alternating wave having a multiplicity of zero voltage intermissions. The grain topography of the plate can be varied by changing the frequency and duration of the intermissions in the wave.
    Type: Grant
    Filed: August 6, 1984
    Date of Patent: October 8, 1985
    Assignee: Polychrome Corporation
    Inventor: Donald J. Riley
  • Degreasing and deoxidizing aluminum foil
    Patent number: 4419259
    Abstract: Aluminum foil, particularly for electrolytic capacitors, is degreased and deoxidized before processing by contacting the foil with a solution containing phosphoric acid and a nonionic surfactant. An agent corrosive to aluminum may be present. Contacting time is 20 to 240 seconds, and the temperature is 45.degree. to 85.degree. C. Preferably, 1.0-7.0 M phosphoric acid is used with 2 g/l of the nonionic surfactant and 1.0-3.0 g/l of corrosive agent.
    Type: Grant
    Filed: October 22, 1981
    Date of Patent: December 6, 1983
    Assignee: Sprague Electric Company
    Inventors: Donald J. Riley, John W. Scott