Patents by Inventor Dale M. Stieferman

Dale M. Stieferman 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).

  • Fill controller for liquified gas container and apparatus for filling tank using same
    Patent number: 5544685
    Abstract: An electronic sensor and fill controller for use with a refillable liquid gas container is disclosed. The present invention in broadest terms comprises a valve body for the container, a shaft extending from the valve body into the container, an electronic sensor disposed on the shaft, and a controller adapted to initiate, terminate or alter an electrical signal once the sensor senses contact with the liquified gas.
    Type: Grant
    Filed: September 2, 1994
    Date of Patent: August 13, 1996
    Assignee: Keifer Controls, Inc.
    Inventor: Dale M. Stieferman
  • One step refrigerant recover/recycle and reclaim unit
    Patent number: 5442930
    Abstract: A device that recovers, recycles and/or reclaims refrigerant for air conditioning systems, refrigeration systems, heat exchange systems and other similar systems. The device vaporizes the refrigerant first and then removes oil and other contaminants from the refrigerant in a separate separator.
    Type: Grant
    Filed: October 22, 1993
    Date of Patent: August 22, 1995
    Inventor: Dale M. Stieferman