Patents by Inventor Mark Durfee

Mark Durfee 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).

  • Patent number: 4922599
    Abstract: An improved transmission for a Volkswagen brand of automobile which has five forward speeds rather than the stock four forward speeds. The transmission uses the vast majority of the parts of the four speed transmission but modifies the four speed transmission by extending the main shaft and the pinion shaft by threading shaft extensions onto the end of both of these shafts. In addition, a new gear carrier housing of greater length and a new nose cone of shorther length are substituted for the original gear carrier housing and nose cone. The method of making this conversion is also described.
    Type: Grant
    Filed: January 9, 1989
    Date of Patent: May 8, 1990
    Inventor: Mark Durfee