Patents by Inventor Robert X. Campbell

Robert X. Campbell 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: 6159118
    Abstract: A guide pulley mounting mechanism for use with a bicycle derailleur. A rear take-up pulley is mounted to a plunger rod that travels within a plunger frame in a more or less horizontal arrangement with respect to the bicycle frame. A bias spring mechanism urges the rear take-up pulley in an outboard direction such that tension is maintained on the chain as different main gear sprockets are selected.
    Type: Grant
    Filed: March 22, 1999
    Date of Patent: December 12, 2000
    Inventor: Robert X. Campbell