1. BRUCE H. BURR
ADDENDUM
PAPERS, AWARDS AND PATENTS
"O-Ring Wear Test Machine" published in Journal of Wear (Wear, 68 (1981) pp. 21-32).
"An Equation for the Abrasive Wear of Elastomeric O-Ring Materials" published in the Journal of
Wear (Wear, 81 (1982) pp. 347-356).
Made oral presentation titled "Abrasive Wear of O-Ring Materials" at the 1983 Energy-Sources
Technology Conference.
Made oral presentation on Hughes metal bearing seal technology at the December 1989 Drill Bit
Symposium put on by the SPE Drilling Study Group.
Presented technical paper titled "The Metal Seal - State of the Art Rock Bit Technology for
Geothermal Drilling Applications" at the Geothermal Resources Council 1990 Annual Meeting.
Published technical article titled "New Generation ATM Bits Provide Versatility Throughout The
Far East" in Asia Oil and Gas, April 1990.
Co-authored technical paper presented at the IADC/SPE meeting in Amsterdam in March 1991
titled "Metal Bearing Seal Technology Improves Drilling Efficiency of Rolling Cutter Bits in High
RPM North Sea Applications."
Co-authored a technical paper for presentation at the Southwestern Petroleum Short Course in
April 1991 titled "Rock Bit Metal Bearing Seal Technology."
Received from Petroleum Engineer International the "1988 Special Meritorious Award for
Engineering Innovation" for the Hughes Tool Co. ATM Metal Face Seal.
Patents Granted
U.S. patent number 4,491,428 dated January 1, 1985 "Earth Boring Drill Bit With Snap Ring
Cutter Retention."
U.S. patent on O-ring wear test machine.
U.S. patent number 4,516,641 dated May 14, 1985 "Earth Boring Bit With Pressure Compensating
Rigid Face Seal."
U.S. patent number 4,519,719 dated May 28, 1985 "Earth Boring Bit With Pressure Compensating
Bearing Seal."
U.S. patents, number 4,753,303 dated June 28, 1988 "Earth Boring Bit With Two Piece Bearing
and Rigid Face Seal Assembly" and number 4,666,001 dated May 19, 1987 "Earth Boring Bit With
Improved Rigid Face Seal Assembly."
U.S. patent number 4,671,368 dated June 9, 1987 "Earth Boring Bit With Shear Compression
Seal."
U.S. patent number 4,899,838 dated February 13, 1990 "Earth Boring Bit With Convergent Cutter
Bearing."

2. U.S. patent number 6,176,330 dated October 12, 1999 "Rock Bit Face Seal Having Anti-Rotation
Pins.”
U.S. patent number 6,247,545 dated December 2, 1999 "Single Energizer Face Seal For Rock
BitsWith Floating Journal Bearings."
U.S. patent number 6,427,790 dated Nov 8, 2001 "Rock Bit Face Seal Having Lubrication Gap."
U.S. patent number 7,036,613 dated Sept 12, 2003 "Lip Seal For Roller Cone Drill Bit."