3805606 is referenced by 18 patents and cites 2 patents.

A method and several mechanisms for carrying out the method are disclosed. The method of (1) generating torque pulses by engaging a drill bit on the lower end of a rotating drill string in the bottom of a wellbore, and (2) monitoring the top of the drill string for the torque pulses therein may be practiced by a drill bit disconnectably attached with a coupling to the lower end of a drill string in a wellbore for being momentarily and precisely uncoupled and coupled during drilling to interrupt the torque transmission for generation of torque pulses in the drill string for being monitored at the surface. Mechanical, electrical, and fluid operated couplings are disclosed for rapidly coupling and uncoupling the drill bit from the drill string.

Title
Method and apparatus for transmission of data from drill bit in wellbore while drilling
Application Number
05/279,898
Publication Number
3805606
Application Date
August 11, 1972
Publication Date
April 23, 1974
Inventor
Rundell Herbert A
Park Jack H
Stelzer Roland B
Agent
Ries C G
Whaley T H
Assignee
Texaco
IPC
175()
E21b 47/12
E21B 47/16
E21B 17/02
E21B 17/07
E21B 47/12
View Original Source