Patents by Inventor Ellen Y. Chu

Ellen Y. Chu 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).

  • Coatable urea-aldehyde solutions containing a cocatalyst, coated abrasives made using said solutions, and method of making coated abrasives
    Patent number: 5486219
    Abstract: Coatable urea-aldehyde binder precursor compositions including a urea-aldehyde resin and a cocatalyst yield more consistent quality coated abrasives. In addition, the compositions have longer pot life and allow curing at lower temperatures. The urea-aldehyde resins have an aldehyde/urea ratio of at least about 1.0, more preferably ranging from about 1.0 to about 2.0, and a free aldehyde content ranging from about 0.1 to about 3.0 weight percent based on weight of total aldehyde. The cocatalyst consists essentially of a Lewis acid and a salt selected from the group consisting of ammonium ion salts and organic amine salts. Methods of making coated and other abrasive articles using the compositions are also described.
    Type: Grant
    Filed: September 6, 1994
    Date of Patent: January 23, 1996
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: Jeffrey E. Ford, Ellen Y. Chu, Harold E. Rude