Patents by Inventor Francis W. Jackson

Francis W. Jackson 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).

  • Knife-edge rocker bearing internal combustion engine
    Patent number: 5398652
    Abstract: Use of a low friction "Knife-edge" pivot bearing for a rocker arm drive for an Internal Combustion Engine; Controlling chamber pressure or TDC volume through 1) adjusting TDC volume as a function of engine operational conditions or 2) an energy store and return device including selection of TDC volume as a function of variable inlet valve timing and 3) increased nominal operating point piston speed.
    Type: Grant
    Filed: November 5, 1992
    Date of Patent: March 21, 1995
    Inventor: Francis W. Jackson
  • Pressure balanced piston rings
    Patent number: 5271315
    Abstract: Force balanced (or nearly balanced) rings to eliminate (or greatly reduce) pressure caused force build up of the ring(s) against the cylinder wall. Especially important in high pressure engines and/or where increased depth ring/cylinder contact surface is used.
    Type: Grant
    Filed: September 18, 1992
    Date of Patent: December 21, 1993
    Inventor: Francis W. Jackson
  • Multiple piston expansion chamber engine
    Patent number: 4860701
    Abstract: A method of extracting work from two chambers including a working chamber surrounded by a reciprocating sleeve and an auxiliary chamber surrounding the sleeve.
    Type: Grant
    Filed: February 1, 1988
    Date of Patent: August 29, 1989
    Inventor: Francis W. Jackson
  • Multiple piston expansion chamber engine
    Patent number: 4741296
    Abstract: A method of extracting work from two chambers including a working chamber surrounded by a reciprocating sleeve and an auxiliary chamber surrounding the sleeve.
    Type: Grant
    Filed: October 30, 1986
    Date of Patent: May 3, 1988
    Inventor: Francis W. Jackson
  • Multiple piston expansion chamber engine
    Patent number: 4715328
    Abstract: Multiple expansion chambers are configured to partially expand the combusted charge in the combustion chamber and then to complete the expansion process using a supplemental expansion chamber with chamber isolation designs.
    Type: Grant
    Filed: October 15, 1985
    Date of Patent: December 29, 1987
    Inventor: Francis W. Jackson
  • Multiple piston expansion chamber engine
    Patent number: 4580532
    Abstract: Multiple expansion chambers are configured to partially expand the combusted charge in the combustion chamber and then to complete the expansion process using a supplemental expansion chamber with chamber isolation designs.
    Type: Grant
    Filed: September 6, 1984
    Date of Patent: April 8, 1986
    Inventor: Francis W. Jackson
  • Multiple piston expansion chamber engine
    Patent number: 4570580
    Abstract: Multiple expansion chambers are configured to partially expand the combusted charge in the combustion chamber and then to complete the expansion process using a supplemental expansion chamber with chamber isolation designs.
    Type: Grant
    Filed: December 31, 1984
    Date of Patent: February 18, 1986
    Inventor: Francis W. Jackson
  • Multiple piston expansion chamber engine
    Patent number: 4489681
    Abstract: A multiple piston expansion chamber internal combustion engine wherein the charge is ignited and combusted (or partially combusted) and partially expanded by one or more of the pistons and after partial expansion thereof additional pistons augment the expansion process.
    Type: Grant
    Filed: December 2, 1981
    Date of Patent: December 25, 1984
    Inventor: Francis W. Jackson