Patents by Inventor Charles D. Crisp

Charles D. Crisp 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: 5082327
    Abstract: A portable lift apparatus for use with chairs, seats and the like comprises a bottom portion that is to be placed atop the seat bottom of the chair and a top portion pivotally mounted to the bottom portion. Support brackets are fixed to the top and bottom portions for mounting the top portion for pivotal movement between a lowered position, a raised position and a neutral position intermediate its raised and lowered positions. Springs are provided for urging the top portion toward its raised position. Latches are provided for releasably securing the top portion in the lowered and neutral positions and comprises means for preventing the top portion from becoming unlatched while in the neutral position. The latches further comprise hook-shaped members attached to the top and bottom portions adapted to partially overlie one another to define a latch opening. A latch pin is movably mounted within the latch opening for movement between an unlocking position and an locking position.
    Type: Grant
    Filed: October 19, 1990
    Date of Patent: January 21, 1992
    Inventor: Charles D. Crisp