Patents Assigned to Pyroil Canada
  • Closure plugs
    Patent number: 5649511
    Abstract: A washerless closure plug for closing althreaded opening in the block of automotive engines includes an externally threaded nipple surrounded by a sharp shoulder, which shoulder is provided with a pair of forwardly facing ribs. When the nipple is screwed into an engine block the ribs form a seal with the block wall to resist leakage from the block and to damp the transmission of vibrational forces from the block to the closure plug which tend to unscrew the closure plug from the block.
    Type: Grant
    Filed: May 9, 1996
    Date of Patent: July 22, 1997
    Assignee: Pyroil Canada
    Inventor: Vinh Nguyen
  • Washerless block heater
    Patent number: 5553578
    Abstract: A washerless block heater for automotive engines includes an externally threaded nipple surrounded by a sharp shoulder, which shoulder is provided with a pair of forwardly facing ribs. When the nipple is screwed into an engine block the ribs form a seal with the block wall to resist leakage from the block and to damp the transmission of vibrational forces from the block to the heater body which tend to unscrew the heater from the block.
    Type: Grant
    Filed: October 24, 1995
    Date of Patent: September 10, 1996
    Assignee: Pyroil Canada
    Inventor: Vinh L. Nguyen
  • Car heater
    Patent number: D322665
    Type: Grant
    Filed: July 31, 1989
    Date of Patent: December 24, 1991
    Assignee: Pyroil Canada Limited
    Inventor: Bert Bobrovniczky
  • Car heater
    Patent number: D322666
    Type: Grant
    Filed: July 31, 1989
    Date of Patent: December 24, 1991
    Assignee: Pyroil Canada Limited
    Inventor: Bert Bobrovniczky