Patents by Inventor Silviu Dumitrescu

Silviu Dumitrescu 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).

  • Gaseous and liquid fuel injection valve with concentric needles
    Patent number: 6439192
    Abstract: A gaseous and liquid fuel injection valve for an internal combustion engine comprises an injection valve body that houses two separate concentric fuel injection valve assemblies. The first valve assembly is a pilot fuel needle valve assembly, which comprises a first needle movable in the direction of the longitudinal axis of the body between an open and a closed position. The second valve assembly is a gaseous fuel needle valve assembly, which comprises a second needle movable in the direction of the longitudinal axis between an open and a closed position. The gaseous fuel needle valve assembly controls the injection of gaseous fuel into the combustion chamber through a plurality of gaseous fuel holes formed in a nozzle tip of the gaseous fuel needle valve assembly. At least one of the nozzle tips is rotatable to thereby change the position of the pilot fuel holes with respect to the gaseous fuel holes.
    Type: Grant
    Filed: October 24, 2000
    Date of Patent: August 27, 2002
    Assignee: Westport Research Inc.
    Inventors: Patric Ouellette, Alain M. J. Touchette, Guowei Li, Silviu Dumitrescu