Patents by Inventor Dave M. Tumlin

Dave M. Tumlin 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).

  • Natural gamma ray logging sub
    Patent number: 5285065
    Abstract: A natural gamma tag marking materials for sub or permanent markers used in gamma logging operations, such natural gamma materials having a gamma count of between 200 and 1000 counts per second. The instant invention further discloses a typical Sub, for insertion in a drilling operation, utilizing natural gamma element compounds which are considered to be non-hazardous and effective as tag markers when used in wireline logging operations.
    Type: Grant
    Filed: August 17, 1992
    Date of Patent: February 8, 1994
    Inventors: Robert A. Daigle, Dave M. Tumlin