04739841 is referenced by 44 patents and cites 7 patents.

In the representative embodiments of the present invention described herein, new and improved methods and apparatus are disclosed for measuring various forces acting on an intermediate body between the lower end of a drill string and the earth-boring apparatus coupled thereto whereby the magnitudes and angular directions of bending moments and side forces acting on the earth-boring apparatus can be readily determined so that predictions can be made of the future course of excavation of the apparatus.

Title
Methods and apparatus for controlled directional drilling of boreholes
Application Number
6/896891
Publication Number
4739841
Application Date
August 15, 1986
Publication Date
April 26, 1988
Inventor
Pralay K Das
Sugar Land
TX, US
Assignee
Anadrill Incorporated
TX, US
IPC
E21B 47/022
E21B 7/08
View Original Source