Patents by Inventor David Thomas Hanns

David Thomas Hanns 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).

  • Sub-assembly for lubricating rock drill bit
    Patent number: 5927439
    Abstract: A lubricating sub-assembly for a rock drill, comprising a housing coupled into a drill string carrying a drill bit at its front end, a cavity disposed within the housing for holding a predetermined amount of a bearing lubricant, passages for communicating the interior of the cavity with one or more air circulation passages provided in the bit leading to bearings within the drill bit, and a valve mechanism for dispensing a preset amount of lubricant from the cavity to the communicating means passages.
    Type: Grant
    Filed: March 25, 1997
    Date of Patent: July 27, 1999
    Inventor: David Thomas Hanns