U.S. patents available from 1976 to present.
U.S. patent applications available from 2005 to present.

Low pressure LPG vapor fuel injection

Patent 5671711 Issued on September 30, 1997. Estimated Expiration Date: Icon_subject December 7, 2015. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.

Patent References

Internal combustion engine dual fuel system
Patent #: 4335697
Issued on: 06/22/1982
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Air/fuel induction system for a multi-cylinder internal combustion engine
Patent #: 4545345
Issued on: 10/08/1985
Inventor: Pagdin ,   et al.

Air/fuel induction system for a multi-cylinder internal combustion engine
Patent #: 4617904
Issued on: 10/21/1986
Inventor: Pagdin

Gasoline feed device for internal combustion engine
Patent #: 4829966
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Mixture control unit system for soil venting apparatus
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Issued on: 12/10/1991
Inventor: Davis, et al.

Flow control system
Patent #: 5150690
Issued on: 09/29/1992
Inventor: Carter, et al.

Liquified petroleum gas fuel supply system
Patent #: 5291869
Issued on: 03/08/1994
Inventor: Bennett

Method and system for improved fuel system performance of a gaseous fuel engine
Patent #: 5367999
Issued on: 11/29/1994
Inventor: King, et al.

Acoustical damping device for gaseous fueled automotive engines
Patent #: 5373824
Issued on: 12/20/1994
Inventor: Peters, et al.

Fuel injection
Patent #: 5398657
Issued on: 03/21/1995
Inventor: Press, et al.

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Inventor

Application

No. 568726 filed on 12/07/1995

US Classes:

123/299, Using multiple injectors or injections123/527Gaseous fuel and air mixer

Examiners

Primary: Solis, Erick

Attorney, Agent or Firm

Foreign Patent References

  • 2422832 FR 12/13/1979
  • 1-182544 A JP. 07/13/1989

International Class

F02B 003/00

Abstract

An internal combustion engine (14) having a fuel supply system (10) for supplying propane vapor to the intake system of the engine. Multi-point fuel injectors (30) are located at each cylinder (12) for primary delivery of the propane vapor. In addition, an engine controller (36) activates supply orifices (34), when needed, to supplement the amount of propane vapor delivered by the fuel injectors (30).

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