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U.S. PATENT AND TRADEMARK OFFICE
Office of Electronic Information Products
Patent Technology Monitoring Division (PTMD)

Patenting In Technology Classes,
Breakout By Organization

Count of 1998 - 2002 Utility Patent Grants,
By Calendar Year of Grant
With Patent Counts Based on Primary Patent Classification

- Explanation of Data -

Rank Ordered Listing of Organizations Receiving 5 or More Utility Patents During the Period
Having Primary Classification In

Class 166, Wells (shafts or deep borings in the earth, e.g., for oil and gas)

( technology class is determined by the primary classification assigned to the patent- see 'Explanation of Data' )
( patent ownership is determined by the first-named assignee listed on a patent )

The following table displays first-named assignees and counts of their associated patents, as distributed by the year of patent grant
First-Named Assignee 1998 1999 2000 2001 2002 Total
HALLIBURTON ENERGY SEVICES, INC. 52 84 97 97 85 415
~Individually Owned Patent 73 54 81 126 70 404
BAKER HUGHES INCORPORATED 43 27 37 56 38 201
SCHLUMBERGER TECHNOLOGY CORPORATION 11 26 30 64 65 196
WEATHERFORD/LAMB, INC. 16 9 24 18 34 101
CAMCO INTERNATIONAL INC. 3 16 18 25 4 66
ABB VETCOGRAY INC. 9 10 11 11 11 52
SHELL OIL COMPANY 0 3 16 13 18 50
ATLANTIC RICHFIELD COMPANY 4 8 16 8 0 36
TEXACO INC. 6 7 13 6 1 33
FMC CORPORATION 12 6 4 1 9 32
BJ SERVICES CO 2 6 5 7 8 28
INSTITUT FRANCAIS DU PETROLE 7 3 2 8 0 20
COOPER CAMERON CORPORATION, INC. 0 4 5 4 6 19
MARATHON OIL COMPANY 7 2 4 2 4 19
SMITH INTERNATIONAL INC. 3 4 3 4 5 19
HALLIBURTON CO. 14 0 0 0 0 14
EXPRO NORTH SEA LIMITED 0 6 5 2 0 13
MOBIL OIL CORP. 2 5 2 3 0 12
PHILLIPS PETROLEUM COMPANY 2 2 2 3 3 12
ELF EXPLORATION PRODUCTION 0 3 3 5 0 11
EXXONMOBIL UPSTREAM RESEARCH COMPANY 0 0 3 5 3 11
PETROLEO BRASILEIRO S.A. PETROBRAS 1 0 5 2 3 11
KVAERNER OIFIELD PRODUCTS, INC. 0 3 5 0 2 10
DRESSER INDUSTRIES, INC. 0 3 3 3 0 9
SPECIALIZED PETROLEUM SERVICES LTD. 0 0 3 4 2 9
AMOCO CORPORATION 5 3 0 0 0 8
DRIL-QUIP, INC. 0 1 3 4 0 8
FRANK'S INTERNATIONAL, INC. 2 2 0 1 3 8
PES, INC. 4 1 3 0 0 8
UNION OIL COMPANY OF CALIFORNIA 2 2 1 2 1 8
VASTAR RESOURCES, INC. 1 4 2 1 0 8
DEN NORSKE STATS OLJESELSKAP A.S. 0 2 0 5 0 7
FMC TECHNOLOGIES, INC. 0 0 0 0 7 7
KUDU INDUSTRIES, INC. 0 1 5 0 1 7
ALBERTA OIL SANDS TECHNOLOGY & RESEARCH AUTHORITY 1 2 0 3 0 6
BESTLINE LINER SYSTEMS, INC. 4 1 0 0 1 6
CONOCO, INC. 1 0 1 1 3 6
EXXON PRODUCTION RESEARCH COMPANY 1 4 1 0 0 6
HYDRIL COMPANY L.P. 1 0 2 1 2 6
INTEVEP, S.A. 0 0 0 1 5 6
WEATHERFORD INTERNATIONAL, INC. 0 1 2 3 0 6
FRANK'S CASING CREW & RENTAL TOOLS, INC. 2 1 0 1 1 5
GAS RESEARCH INSTITUTE 1 2 2 0 0 5
TIW CORPORATION 3 0 0 1 1 5


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