Patents Represented by Attorney Dana E. Dana E. Keech Keech

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  • Drilling shock sub
    Patent number: 4173130
    Abstract: A drill string protecting axial shock absorbing sub which is relatively short and rugged and comprises inner and outer telescopically intersplined tubular elements forming therebetween an annular shock absorbing cushion confining piston chamber which is filled with a tightly packed suspension of 3/8" polyurethane pellets in a highly heat resistant lubricant such as "Mobil #1 Synthesized Engine Lubricant".
    Type: Grant
    Filed: January 31, 1978
    Date of Patent: November 6, 1979
    Inventors: Wayne N. Sutliff, Jim L. Downen