Patents by Inventor Richard A. Pfeil, Jr.

Richard A. Pfeil, Jr. 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: 5024061
    Abstract: A refrigerant recovery processing and storage unit (RPSU) for removing and storing refrigerant from an air conditioning and refrigeration system (AC&R) is disclosed. The unit creates a pressure difference between the inlet and outlet side of the AC&R, and a pressurized motivating gas is delivered to the inlet and flows therethrough to the outlet. The pressurized gas flow drives the refrigerant fluid from the AC&R. The RPSU separates the mixed refrigerant from the pressurized gas, and delivers the separated refrigerant to a detachable storage unit. After the AC&R is repaired, the refrigerant is returned from the storage tank to the AC&R.
    Type: Grant
    Filed: December 12, 1989
    Date of Patent: June 18, 1991
    Assignee: Terrestrial Engineering Corporation
    Inventors: Richard A. Pfeil, Jr., Charles M. Pirrera