Patents by Inventor Henk Dolfsma

Henk Dolfsma 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).

  • Lubrication of refrigerant compressor bearings
    Patent number: 5469713
    Abstract: A refrigerant device comprising at least one bearing disposed in a housing having a refrigerant flow path. The bearing is contacted with a lubricant charge of a small quantity of lubricant dissolved in liquid refrigerant. At least a portion of the liquid refrigerant proximate the bearing is vaporized to deposit lubricant on the bearing in sufficient quantity to provide for the lubrication thereof. The refrigerant may be vaporized by heat or by pressure drop, or by both. A sensor may be provided to monitor or control temperature and pressure conditions to insure that sufficient refrigerant is vaporized to form a lubricant liquid of at least about 75% lubricant by volume.
    Type: Grant
    Filed: January 21, 1994
    Date of Patent: November 28, 1995
    Assignee: SKF USA, Inc.
    Inventors: Frank Wardle, Bo Jacobson, Henk Dolfsma, Arthur Butterworth