Patents by Inventor Edward A. Fletcher

Edward A. Fletcher 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: 4570589
    Abstract: A method of attenuating detonation in an internal combustion engine having a combustion chamber and a piston reciprocably located in a cylinder forming the combustion chamber. The piston has an air/fuel mixture intake, compression, power, and exhaust movement. An air/fuel mixture is introduced in the combustion chamber during the intake movement of the piston. The air/fuel mixture is compressed in the combustion chamber. The compressed air and fuel is ignited with spark at the completion of the compression movement of the piston causing the air/fuel mixture to burn and establishing a flame front that propagates across the combustion chamber. The combustion chamber abruptly increases in the cross sectional area in the direction of travel of the flame front. The expanding burning air/fuel mixture in the combustion chamber moving across the abrupt increase in cross sectional area of the combustion area attenuates detonation in the combustion chamber.
    Type: Grant
    Filed: November 19, 1984
    Date of Patent: February 18, 1986
    Assignee: Regents of the University of Minnesota
    Inventor: Edward A. Fletcher
  • Patent number: 4567863
    Abstract: A piston for attenuation of detonation in a combustion chamber in an internal combustion engine has a top wall accommodating a cap. The cap has an upwardly and inwardly inclined first section, a downwardly and inclined second section and a transverse wall at the inner end of the second section. The transverse wall projects upwardly from the top wall of the piston and extends across the piston in the direction of movement of the flame front in the combustion chamber. The first section has a plurality of channels providing paths for the flame front. The second section has an additional channel providing a further path for the flame front. The flame front commences at the ignition point moves over the cap and the transverse wall. The transverse wall provides an abrupt increase in the cross sectional areas of the combustion chamber in the direction of travel of flame front which attenuates detonation in the combustion chamber.
    Type: Grant
    Filed: November 19, 1984
    Date of Patent: February 4, 1986
    Assignee: Regents of the University of Minnesota
    Inventor: Edward A. Fletcher
  • Patent number: 4501236
    Abstract: A piston for attentuation of detonation in the combustion chamber of an internal combustion engine has a top wall accommodating a cap. The cap has a flush extension of the cylindrical portion of the side wall of the piston and a transverse wall projected generally upward from the top wall of the piston. The transverse wall has a convex curve with a radius center located along the outer edge of the top wall of the piston in contiguous relationship to the ignition point of the air/fuel mixture in the combustion chamber. The transverse wall of the cap is located generally normal to the direction and movement of the flame front commencing from the ignition point and provides an abrupt increase in the cross sectional area of the combustion chamber in the direction of travel of the flame front to attenuate detonation in the combustion chamber.
    Type: Grant
    Filed: August 9, 1982
    Date of Patent: February 26, 1985
    Assignee: Regents of the University of Minnesota
    Inventor: Edward A. Fletcher
  • Patent number: 4053576
    Abstract: A system for producing and separating hydrogen and oxygen from water in which water is pumped through a preferentially permeable walled vessel heated to a high temperature by a solar energy concentrator. The water dissociates at high temperatures. Lower molecular weight components, especially hydrogen, diffuse preferentially through the vessel walls and are drawn off and separated. Oxygen may be separated from the products which do not diffuse through the walls by conventional separation techniques. A system is provided for making use of solar energy to produce storable fuels for use during periods of no sunshine.
    Type: Grant
    Filed: May 19, 1975
    Date of Patent: October 11, 1977
    Assignee: The Regents of the University of Minnesota
    Inventor: Edward A. Fletcher
  • Patent number: 3967269
    Abstract: An analogue-to-digital converter of the parallel-series-parallel type has additional circuitry associated with the second quantization stage which accepts overflow caused by errors in the first quantization stage and generates a correction signal to correct the output of the first quantization stage.
    Type: Grant
    Filed: April 29, 1974
    Date of Patent: June 29, 1976
    Assignee: British Broadcasting Corporation
    Inventor: Russell Edward Fletcher