Free Motion to Compel - District Court of Colorado - Colorado

Case 1:03-cv-02579-RPM

Document 110-9

Filed 10/05/2006

Page 1 of 3

VARCO V. PASON
EXHIBIT 6

Case 1:03-cv-02579-RPM
(12)

Document 110-9

Filed 10/05/2006

Page 2 of 3

EX PARTE REEXAMINATION CERTIFICATE (5436th)
(10) (4s)

United States Patent
Bowden
(54) AUTOMATIC DRILLING SYSTEM (75) Inventor: Bobbie J. Bowden. Gonzales. TX (US) (73) Assignee: Wildcat Services, L.P.. Cypress. TX

Number: US 5,474,142 C1 Certificate Issued: Jul. 4,2006

Pritnon. Ero~riiaer-Matthew C. Graham

(57)

ABSTRACT

(US)
Reexamination Request: No. 901006,919, Jan. 26, 2W Reexamination Certificate for: Patent No.: 5,474,142 Issued: Dec. 12, 1 9 5 Appl. No.: 08/050,527 Filed: Apr. 19,1993 (51) I n t Ci. EZIB 19/08 (2W6.01)

An automatic drilling system regulates the drill srring of a drilling rig in response lo any one of. any combination of. or all of drilling fluid pressure. bit weight. drill string torque. and drill string RPM to achieve an optimal rate of bit penetration. The automatic drilling system includes a drilling fluid pressure sensor, a bit weight sensor. a drill string torque sensor, and a drill string RPM sensor which deliver a drilling fluid pressure signal, a bit weight signal, a drill string torque signal, and a drill string RPM signal to a drilling fluid pressure regulator, a bit weight regulator, a drill string regulator,and a drill string R ~ M me reeulators control a drill strine controller in resoonse to the "
0

(52) U.S. CI. ............................ 175127: 175/162; 175157 (58) Field of Classification Search ....................... None See application file for complcte search history (56) References Cited U.S. PATENT DOCUMENTS 3,223,183
A

above signals so that it manipulates the drilling rig to release the drill string at a rare which maintains the maximum rate of bit penetration

1U19.55 V m y

........................ 17Sn7

Case 1:03-cv-02579-RPM

Document 110-9

Filed 10/05/2006

Page 3 of 3

1 EX PARTE REEXAMINATION CERTIFICATE ISSUED UNDER 35 U.S.C. 307
N O AMENDMENTS HAVE BEEN M A D E Mf T H E PATENT

2
AS A RESULT O F REEXAMINATION. I T H A S BEEN DETERMINED THAI: The patentability 01 claims 1-15 is confirmed.

NOV - 1185