Patents by Inventor Thomas R. Doster

Thomas R. Doster 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).

  • Reversible umbrella
    Patent number: 5909746
    Abstract: In this invention an umbrella with a cover, preferably square or rectangular, is supported on a telescopic shaft by articulated ribs that extend from the shaft beneath the cover. The articulated ribs are connected to auxiliary ribs and both are controlled by guides and stabilizers that extend radially from a reciprocable transfer sleeve on the telescopic shaft and move the ribs and auxiliary ribs to fold the cover inside out as the transfer sleeve is lowered on the shaft, the shaft is shortened, and the umbrella is closed.
    Type: Grant
    Filed: November 12, 1997
    Date of Patent: June 8, 1999
    Inventors: Thomas R. Doster, Karel J. Doster
  • Umbrella handle
    Patent number: D415611
    Type: Grant
    Filed: November 30, 1998
    Date of Patent: October 26, 1999
    Inventor: Thomas R. Doster