Patents by Inventor Darrell E. Gravett

Darrell E. Gravett 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).

  • Trailer coupling apparatus
    Patent number: 3993325
    Abstract: A standard automatic coupling apparatus for connecting a trailer to a prime mover, the coupling apparatus being of a type having a plate with a central slot disposed therein and having locking structure in the slot so that a pin connected to the trailer can be selectively locked into the slot. The plate is pivotally mounted alternatively to either a truck bed structure or to an agricultural tractor by means of novel structures.
    Type: Grant
    Filed: August 11, 1975
    Date of Patent: November 23, 1976
    Inventor: Darrell E. Gravett