Patents by Inventor Dwight A. Caswell, Sr.

Dwight A. Caswell, Sr. 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).

  • Variable compression ratio piston
    Patent number: 4137873
    Abstract: A piston for use in an internal combustion engine providing a variable compression ratio in response to pressure within the combustion chamber. The pistion includes a base portion which is connected to a crank and moves in an engine cylinder. Joined to the base is a head portion which includes a flexible top wall adjacent the combustion chamber which allows the head to compress downwardly toward the base in response to pressure in the combustion chamber.
    Type: Grant
    Filed: October 11, 1977
    Date of Patent: February 6, 1979
    Inventor: Dwight A. Caswell, Sr.