Patents by Inventor Neil W. Herst

Neil W. Herst 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).

  • Rotary power slips
    Patent number: 4333209
    Abstract: Improved rotary power slips having a housing for mounting in a rotary table of an earth drilling rig. Air is transferred from a stationary fluid source on the drilling rig to pneumatic cylinders carried by the housing when said housing is static to operate said slips. Transfer is accomplished by expansion of a perforated annular bladder thereby forming an expansive fluid duct between a stationary seal ring connected to the stationary fluid source and an air transfer plate which is rotatable with the housing.
    Type: Grant
    Filed: July 3, 1980
    Date of Patent: June 8, 1982
    Assignee: BJ-Hughes Inc.
    Inventor: Neil W. Herst