Patents by Inventor Alfred B. Pruitt

Alfred B. Pruitt 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).

  • Rotating head for air, gas and mud drilling
    Patent number: 4383577
    Abstract: A rotating head assembly having roller thrust bearings rotatably journaling an inner barrel is provided with pump means for continuous forced circulation of lubricating oil to, and around, the thrust bearings during operation. A lubricating oil chamber substantially surrounds the bearings, which chamber is effectively sealed against leakage of oil fluids, and other debris, into the chamber and lubricating oil out of the chamber. The lower end of the rotatably journaled inner barrel is provided with a stripper rubber structured to enable use of the head with drill pipe of diverse outer diameters.
    Type: Grant
    Filed: February 10, 1981
    Date of Patent: May 17, 1983
    Inventor: Alfred B. Pruitt