Patents by Inventor David F. Hakala

David F. Hakala 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).

  • Brush core and brush driving method
    Patent number: 9524886
    Abstract: A brush core for engaging and rotating a generally cylindrical brush having a hollow bore is provided. The brush core includes, but is not limited to, a body section forming an outer surface for engaging the hollow bore of the cylindrical brush. The outer surface of the body section includes three or more sides.
    Type: Grant
    Filed: May 6, 2010
    Date of Patent: December 20, 2016
    Assignee: ILLINOIS TOOL WORKS INC.
    Inventors: Robert G. Kobetsky, Daniel P. McDonald, Alan Varacins, David F. Hakala, Weijin Li
  • BRUSH CORE AND BRUSH DRIVING METHOD
    Publication number: 20100288305
    Abstract: A brush core for engaging and rotating a generally cylindrical brush having a hollow bore is provided. The brush core includes, but is not limited to, a body section forming an outer surface for engaging the hollow bore of the cylindrical brush. The outer surface of the body section includes three or more sides.
    Type: Application
    Filed: May 6, 2010
    Publication date: November 18, 2010
    Applicant: ILLINOIS TOOL WORKS INC.
    Inventors: Robert G. Kobetsky, Daniel P. McDonald, Alan Varacins, David F. Hakala, Weijin Li
  • Process for treating high-density information disc recording substrates
    Patent number: 4469563
    Abstract: Copper recording substrates for high-density information discs are first passivated in an alkaline oxidizing bath and then the surface oxide layer formed thereby is removed in ammonium chloride solution. This treatment improves the adhesion of a subsequently applied thin layer of chromium which protects the recording substrate during subsequent plating steps.
    Type: Grant
    Filed: August 22, 1983
    Date of Patent: September 4, 1984
    Assignee: RCA Corporation
    Inventor: David F. Hakala
  • Method for producing CRT screen structure
    Patent number: 4255504
    Abstract: Additions of fluorescein or a fluorescein salt and a diol to a photosensitized polymeric material increase the photosensitivity thereof in a method for photodepositing a luminescent-screen structure for a cathode-ray tube.
    Type: Grant
    Filed: July 23, 1979
    Date of Patent: March 10, 1981
    Assignee: RCA Corporation
    Inventor: David F. Hakala