Patents by Inventor Margarete C. Wong

Margarete C. Wong 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).

  • Emergency downhole disconnect tool
    Patent number: 5323853
    Abstract: An emergency downhole disconnect tool for use in a drilling well conduit having hydraulic pressure activated and electricity activated means for disconnecting the tool from the drilling assembly by disconnecting telescoping first and second releasably connected parts.
    Type: Grant
    Filed: April 21, 1993
    Date of Patent: June 28, 1994
    Assignee: Camco International Inc.
    Inventors: Dwayne D. Leismer, Margarete C. Wong