Method of unsticking material delivery apparatus

Details Method of unsticking material delivery apparatus Method of unsticking material delivery apparatus

1993-06-29

1995-01-31

Envall, Jr., Roy N.

Boots, shoes, and leggings

198675, 222 63, G05B 902, B65G 3314

Patent

active

053863615

ABSTRACT:
A method of unsticking a material delivery apparatus comprises automatically generating and applying to the material delivery apparatus a cyclical drive signal that causes at least two levels of torque to be applied to the material delivery apparatus.

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Halliburton Services general technical data brochure on the Automatic Proppant Control System (No. G-9156 (Rev.)) published prior to June. 29, 1992.

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