Patents Represented by Law Firm Douglas B. Farrow, Esq.
  • Air motor with warm air introduction means to prevent freezing
    Patent number: 5161450
    Abstract: A device to prevent freezng of a reciprocating air motor which drives a reciprocating plunger pump for liquid pressurized transport in which a passage exclusively for exhaust which is connected to an exhaust passage and a exhaust pipe which is connected to this passage exclusively for exhaust are installed, as is a compressed air switch valve and an air tube which supplies hot air to the exhaust passage.
    Type: Grant
    Filed: July 15, 1991
    Date of Patent: November 10, 1992
    Assignee: Graco, Inc.
    Inventor: Yasuo Ishikawa