Patents by Inventor Richard J. Darwood

Richard J. Darwood 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).

  • Binder for abrasive articles, abrasive articles including the same and method of making same
    Patent number: 6682574
    Abstract: A binder for abrasive products, coated abrasive articles and a method of making the same comprising a urea formaldehyde resin precursor cured in the presence of a sole catalyst which consists essentially of at least one salt of an acid with a diamine of the formula H2N—R—NH2 wherein R is an alkylene group of 3 to 10 carbon atoms, and the acid is selected from the group consisting of hydrochloric, citric, nitric, sulphuric, acetic, phosphoric and combinations thereof.
    Type: Grant
    Filed: September 12, 2002
    Date of Patent: January 27, 2004
    Assignee: 3M Innovative Properties Company
    Inventors: Christopher J. Carter, Richard J. Darwood, Roy Stubbs
  • Binder for abrasive articles, abrasive articles including the same and method of making same
    Publication number: 20030079415
    Abstract: A binder for abrasive products, coated abrasive articles and a method of making the same comprising a urea formaldehyde resin precursor cured in the presence of a sole catalyst which consists essentially of at least one salt of an acid with a diamine of the formula H2N—R—NH2 wherein R is an alkylene group of 3 to 10 carbon atoms, and the acid is selected from the group consisting of hydrochloric, citric, nitric, sulphuric, acetic, phosphoric and combinations thereof
    Type: Application
    Filed: September 12, 2002
    Publication date: May 1, 2003
    Inventors: Christopher J. Carter, Richard J. Darwood, Roy Stubbs