Patents by Inventor Chi M. Lei

Chi M. Lei 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).

  • Apparatus for upgrade or repair of in-service pipelines
    Patent number: 5577528
    Abstract: A removable apparatus for upgrade of an in-service pipeline without disrupting the flow of fluid within the in-service pipeline. The removable apparatus comprises at least one enclosure having a top section and a bottom section for temporarily enclosing a pipe section of the in-service pipeline. The top section and bottom sections are sealably disposable around the pipe section. A repairing mechanism for repairing the pipe section or an insertion mechanism for inserting and connecting a pipeline element to the pipe section is disposed within the enclosure.
    Type: Grant
    Filed: November 18, 1994
    Date of Patent: November 26, 1996
    Assignee: Southern California Gas Company
    Inventors: Narayan C. Saha, Gregory J. Drzewiecki, Chi M. Lei