Patents by Inventor Rex D. Callis

Rex D. Callis 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).

  • Dual use pressurized and unpressurized oil sampling apparatus
    Patent number: 5341691
    Abstract: An oil sampling apparatus for taking samples from either pressurized or non-pressurized oil sources is provided. The oil sampling apparatus includes a body configured to define a conduit therethrough, a vacuum passageway defined to extend through the body in fluid communication with the conduit, and a pressurized oil passageway defined to extend through the body in fluid communication with the conduit. The body further defines a rigid tube having a tube interior connectable between a source of pressurized oil and the pressurized oil passageway. A sample bottle is positionable adjacent to the body in fluid tight communication with the conduit and a manually operated vacuum pump is attached in fluid communication to the vacuum passageway to allow oil to be drawn from a non-pressurized oil source, through the conduit, and into the sample bottle.
    Type: Grant
    Filed: March 31, 1992
    Date of Patent: August 30, 1994
    Inventors: Rex D. Callis, John M. Callis