Patents by Inventor David L Lehman

David L Lehman 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: 6883468
    Abstract: A method and apparatus for delivering a mixture of fuel and gas to a combustion chamber of a compression ignition engine. The method and apparatus includes compressing a gas to a pressure sufficient to initiate combustion of a fuel, delivering a stream of the gas toward the combustion chamber, injecting a quantity of fuel into the stream of gas to create a near homogeneous fuel and gas mixture, and delivering the fuel and gas mixture to the combustion chamber such that combustion occurs substantially within the combustion chamber.
    Type: Grant
    Filed: March 27, 2003
    Date of Patent: April 26, 2005
    Assignee: Caterpillar Inc
    Inventor: David L Lehman
  • Publication number: 20040187804
    Abstract: A method and apparatus for delivering a mixture of fuel and gas to a combustion chamber of a compression ignition engine. The method and apparatus includes compressing a gas to a pressure sufficient to initiate combustion of a fuel, delivering a stream of the gas toward the combustion chamber, injecting a quantity of fuel into the stream of gas to create a near homogeneous fuel and gas mixture, and delivering the fuel and gas mixture to the combustion chamber such that combustion occurs substantially within the combustion chamber.
    Type: Application
    Filed: March 27, 2003
    Publication date: September 30, 2004
    Inventor: David L. Lehman
  • Patent number: 6625977
    Abstract: A method and a system for treating an internal combustion engine exhaust gas using a hydrocarbons as fuel. The internal combustion engine exhaust gas contains particulates and toxic substances. Such particulates and toxic substances being liquid and gaseous hydrocarbons, carbon monoxide, and Nox. The system uses carbon dioxide to interact with the exhaust gas. The carbon dioxide is stored within a container at its triple state. The carbon dioxide and the exhaust gas are conducted through an emission exchanger. The exhaust gas is scrubbed or cleaned by the carbon dioxide and the hydrocarbons, carbon monoxide, Nox, and particulate emissions are carried away by a carbon dioxide gas stream. The cleaned exhaust gas can be discharged into the atmosphere. The carbon dioxide gas stream can be cleaned by passing the same through separator components which remove the pollutants therefrom.
    Type: Grant
    Filed: December 20, 2000
    Date of Patent: September 30, 2003
    Assignee: Caterpillar Inc
    Inventor: David L. Lehman
  • Patent number: 6564554
    Abstract: Engines having turbochargers with a mechanically actuated wastegate typically control the wastegate in response to the air pressure at an outlet of a compressor portion of the turbocharger. Some engine configurations don't provide enough compressor outlet pressure variation to suitably control the wastegate. In the present invention, a control strategy is provided for opening and closing a wastegate based on exhaust gas pressure.
    Type: Grant
    Filed: August 7, 2001
    Date of Patent: May 20, 2003
    Assignee: Caterpillar Inc
    Inventors: Robert L. Hercey, Donald W. Heston, David L. Lehman
  • Publication number: 20030029168
    Abstract: Engines having turbochargers with a mechanically actuated wastegate typically control the wastegate in response to the air pressure at an outlet of a compressor portion of the turbocharger. Some engine configurations don't provide enough compressor outlet pressure variation to suitably control the wastegate. In the present invention, a control strategy is provided for opening and closing a wastegate based on exhaust gas pressure.
    Type: Application
    Filed: August 7, 2001
    Publication date: February 13, 2003
    Inventors: Robert L. Hercey, Donald W. Heston, David L. Lehman
  • Patent number: 6474274
    Abstract: A flywheel energy storage system for maintaining fan speed of a cooling fan on an internal combustion engine. The flywheel energy storage system allows a fan to rotate independent of the internal combustion engine and use energy stored in a flywheel for the continued rotation of the fan when a speed of the internal combustion engine falls below a predetermined speed. In this manner, the fan can provide an adequate air flow to cool the components of the internal combustion engine regardless of the speed of the internal combustion engine. To accomplish this, a fan is coupled to a clutch and a flywheel.
    Type: Grant
    Filed: December 14, 2000
    Date of Patent: November 5, 2002
    Assignee: Caterpillar Inc.
    Inventor: David L. Lehman
  • Publication number: 20020073695
    Abstract: A method and a system for treating an internal combustion engine exhaust gas using a hydrocarbons as fuel. The internal combustion engine exhaust gas contains particulates and toxic substances. Such particulates and toxic substances being liquid and gaseous hydrocarbons, carbon monoxide, and Nox. The system uses carbon dioxide to interact with the exhaust gas. The carbon dioxide is stored within a container at its triple state. The carbon dioxide and the exhaust gas are conducted through an emission exchanger. The exhaust gas is scrubbed or cleaned by the carbon dioxide and the hydrocarbons, carbon monoxide, Nox, and particulate emissions are carried away by a carbon dioxide gas stream. The cleaned exhaust gas can be discharged into the atmosphere. The carbon dioxide gas stream can be cleaned by passing the same through separator components which remove the pollutants therefrom.
    Type: Application
    Filed: December 20, 2000
    Publication date: June 20, 2002
    Inventor: David L. Lehman
  • Publication number: 20020073941
    Abstract: A flywheel energy storage system for maintaining fan speed of a cooling fan on an internal combustion engine. The flywheel energy storage system allows a fan to rotate independent of the internal combustion engine and use energy stored in a flywheel for the continued rotation of the fan when a speed of the internal combustion engine falls below a predetermined speed. In this manner, the fan can provide an adequate air flow to cool the components of the internal combustion engine regardless of the speed of the internal combustion engine. To accomplish this, a fan is coupled to a clutch and a flywheel.
    Type: Application
    Filed: December 14, 2000
    Publication date: June 20, 2002
    Inventor: David L. Lehman
  • Patent number: 5927390
    Abstract: A modular radiator arrangement having first and second rows of spaced apart radiator core modules and air directing ducts provide a compact radiator arrangement. The air directing ducts are disposed in spaces between adjacent radiator core modules of the first row and about the radiator core modules of the second row located in alignment with the spaces of the first row of radiator core modules provides cooling air flow of substantially the same temperature to each of the first and second rows of radiator core modules.
    Type: Grant
    Filed: December 8, 1997
    Date of Patent: July 27, 1999
    Assignee: Caterpillar Inc.
    Inventor: David L. Lehman
  • Patent number: 4604795
    Abstract: Apparatus to automatically attach a terminal to electrical wire and thereafter to install insulating pods on the terminal. The apparatus includes a press which attaches the terminal to form a terminated wire and a transfer block which moves the terminated wire to an insulation pod installation station. The pods are delivered to the pod installation station in an interconnected fashion so as to form a strip of pods. The first pod on the strip is separated from the rest of the strip and placed on the terminated wire.
    Type: Grant
    Filed: November 2, 1983
    Date of Patent: August 12, 1986
    Assignee: Burndy Corporation
    Inventors: John C. Collier, David L. Lehman
  • Patent number: 4426772
    Abstract: Apparatus to automatically attach a terminal to electrical wire and thereafter to install insulating pods on the terminal. The apparatus includes a press which attaches the terminal to form a terminated wire and a transfer block which moves the terminated wire to an insulation pod installation station. The pods are delivered to the pod installation station in an interconnected fashion so as to form a strip of pods. The first pod on the strip is separated from the rest of the strip and placed on the terminated wire.
    Type: Grant
    Filed: February 19, 1981
    Date of Patent: January 24, 1984
    Assignee: Burndy Corporation
    Inventors: John C. Collier, David L. Lehman