Patents by Inventor Boyd D. Boitnott

Boyd D. Boitnott 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).

  • Stem sealing for high pressure valve or the like
    Patent number: 3990679
    Abstract: Apparatus and method for sealing a shaft extending between a high-pressure region and a low-pressure region so that the seal life is long, and so that stem torque as a result of the sealing is kept to a minimum. A plurality of sealing elements are provided and arranged so that the differential pressure across any one sealing element is only a fraction of the pressure differential between the high-pressure and the low-pressure regions. Flowable plastic or the like under selected pressures is injected and maintained between adjacent sealing elements.
    Type: Grant
    Filed: March 20, 1975
    Date of Patent: November 9, 1976
    Assignee: Gray Tool Company
    Inventor: Boyd D. Boitnott
  • Stem sealing for high pressure valve or the like
    Patent number: RE29679
    Abstract: Apparatus .?.and method.!. for sealing a shaft extending between a high-pressure region and a low-pressure region so that the seal life is long, and so that stem torque as a result of the sealing is kept to a minimum. A plurality of sealing elements are provided and arranged so that the differential pressure across any one sealing element is only a fraction of the pressure differential between the high-pressure and the low-pressure regions. Flowable plastic or the like under selected pressures is injected and maintained between adjacent sealing elements.
    Type: Grant
    Filed: September 15, 1977
    Date of Patent: June 27, 1978
    Assignee: Gray Tool Company
    Inventor: Boyd D. Boitnott