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U.S. PATENT AND TRADEMARK OFFICE
Electronic Information Products Division
Patent Technology Monitoring Team (PTMT)

Patenting In Technology Classes,
Breakout By Organization

Count of 1969 - 2007 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 048, Gas: Heating and Illuminating

( 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 1969 1970 1971 1972 1973 1974 1975 1976 1977 1978 1979 1980 1981 1982 1983 1984 1985 1986 1987 1988 1989 1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 Total
~INDIVIDUALLY OWNED PATENT 16 6 2 6 10 7 7 12 9 9 8 13 7 12 6 15 8 6 8 3 9 7 3 4 0 4 6 0 2 7 3 4 3 0 2 6 1 8 5 244
TEXACO INC. 1 2 7 0 2 3 10 5 3 2 3 4 3 9 12 9 7 3 13 5 10 5 1 1 10 0 5 4 2 2 0 1 0 0 3 2 1 4 3 157
EXXON RESEARCH + ENGINEERING CO. 4 4 0 3 4 5 8 9 2 5 2 7 3 6 1 1 1 2 1 1 0 0 0 0 0 0 4 1 0 0 1 0 0 0 0 0 0 0 0 75
SHELL OIL COMPANY 1 0 0 1 0 0 3 2 0 0 0 0 0 0 0 1 0 1 1 2 13 10 4 2 1 0 2 0 0 1 1 0 0 0 0 0 0 4 0 50
METALLGESELLSCHAFT AKTIENGESELLSCHAFT 2 1 0 0 1 1 3 6 6 4 3 2 0 2 1 3 3 1 1 2 1 0 2 2 0 0 0 0 0 0 1 0 0 0 0 0 0 0 0 48
UNITED STATES OF AMERICA, DEPARTMENT OF ENERGY 0 0 0 0 0 0 0 8 1 1 3 1 3 3 3 6 0 2 0 2 1 0 1 1 1 0 0 0 0 0 1 0 0 0 0 0 0 0 0 38
TEXACO DEVELOPMENT CORPORATION 0 1 2 2 0 1 1 1 0 2 0 1 2 3 4 7 3 2 4 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 36
BRITISH GAS CORPORATION 0 0 0 0 0 1 1 3 0 7 1 4 1 1 2 2 1 0 0 0 1 0 0 0 0 0 0 0 1 0 1 0 0 0 0 0 0 0 0 27
KRUPP KOPPERS GMBH 0 0 0 0 0 0 0 3 1 0 0 1 0 0 0 0 1 0 1 1 2 8 1 1 0 0 3 1 0 1 0 0 0 0 0 0 0 0 0 25
INSTITUTE OF GAS TECHNOLOGY 2 1 0 3 1 0 4 0 1 0 0 1 0 2 2 1 1 2 2 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 24
CHEVRON RESEARCH & TECHNOLOGY CO. 0 1 2 1 3 3 2 0 0 0 2 1 0 0 1 4 1 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 22
COMBUSTION ENGINEERING INC. 0 0 0 0 0 0 2 0 0 1 2 0 0 3 1 1 1 3 1 0 0 0 0 0 0 1 1 0 4 0 0 0 0 0 0 0 0 0 0 21
GENERAL ELECTRIC COMPANY 0 1 1 0 0 2 0 0 1 3 3 0 4 2 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 0 0 0 1 0 0 20
PHILLIPS PETROLEUM COMPANY 1 3 0 1 1 1 1 0 1 3 1 0 0 0 0 1 1 2 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 17
SIEMENS AKTIENGESELLSCHAFT 0 0 0 0 0 0 2 5 1 0 2 2 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0 0 0 14
UNITED TECHNOLOGIES CORPORATION 3 1 0 0 0 0 0 0 0 4 0 2 1 0 1 0 0 0 0 0 0 0 0 0 1 1 0 0 0 0 0 0 0 0 0 0 0 0 0 14
GENERAL MOTORS CORPORATION 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 2 3 1 7 13
UNITED STATES OF AMERICA, DEPARTMENT OF THE INTERIOR 2 1 3 0 2 4 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 13
AIR PRODUCTS AND CHEMICALS, INC. 0 0 0 0 2 0 1 0 1 0 0 0 0 0 1 0 0 0 0 0 0 1 0 0 0 0 0 0 0 0 0 1 1 0 1 1 0 0 2 12
UNION CARBIDE CORPORATION 0 0 0 0 1 0 0 1 2 0 0 4 0 1 0 1 1 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 12
ATLANTIC RICHFIELD COMPANY 0 0 1 0 1 0 0 0 0 0 0 3 0 2 1 0 0 0 1 0 0 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0 0 0 10
FOSTER WHEELER ENERGY INTERNATIONAL, INC. 0 0 0 0 0 0 0 3 0 1 1 0 0 1 0 2 0 1 0 0 0 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 10
GAS COUNCIL 6 1 3 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 10
HITACHI, LTD 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 0 4 1 0 0 0 0 0 0 1 3 0 0 0 0 0 0 0 0 0 10
MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD. 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 1 1 0 2 5 10
TOYOTA JIDOSHA K.K. 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 2 0 0 2 1 3 1 10
CONOCO, INC. 0 0 0 0 0 0 0 1 0 0 0 2 3 1 0 2 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 9
DR. C. OTTO COMP. G.M.B.H. 0 0 0 0 0 0 0 2 3 2 1 0 0 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 9
INTERNATIONAL FUEL CELLS CORPORATION 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 2 1 0 0 0 1 1 1 0 2 0 0 0 0 0 0 0 0 0 9
RUHRCHEMIE AKTIENGESELLSCHAFT 0 0 1 0 0 0 0 0 0 0 0 0 0 1 1 3 2 0 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 9
BERGWERKSVERBAND GMBH 0 0 0 0 0 0 0 0 0 1 0 0 0 0 2 1 1 0 0 0 0 0 1 0 0 1 1 0 0 0 0 0 0 0 0 0 0 0 0 8
DOW CHEMICAL COMPANY 0 0 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 1 3 2 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 8
EBARA CORPORATION 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 1 2 0 1 1 0 1 0 0 1 8
IMPERIAL CHEMICAL INDUSTRIES PLC 1 0 0 2 0 0 1 1 1 1 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 8
SHELL INTERNATIONALE RESEARCH MAATSCHAPPIJ B.V. 0 0 0 0 0 0 0 1 3 0 2 2 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 8
UOP 0 0 0 1 1 1 1 0 1 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 0 1 0 0 0 8
ALLIS-CHALMERS CORPORATION 0 0 0 0 0 0 0 1 0 0 0 0 1 1 4 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 7
BABCOCK & WILCOX COMPANY 1 0 0 0 0 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 2 1 0 0 1 0 0 0 0 0 0 7
BRENNSTOFFINSTITUT FREIBERG 0 0 0 0 0 0 0 0 0 0 0 0 2 2 1 0 0 0 2 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 7
HYDROCARBON RESEARCH INC. 0 0 0 0 1 1 0 1 0 1 0 1 0 1 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 7
JAPAN GASOLINE CO., LTD 1 0 0 0 0 0 2 2 2 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 7
KRAFTWERK UNION AKTIENGESELLSCHAFT 0 0 0 0 0 0 0 0 0 1 0 1 2 0 0 0 3 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 7
BATTELLE MEMORIAL INSTITUTE 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 1 0 0 0 0 0 2 1 0 1 0 0 0 0 0 0 0 6
CONSOLIDATION COAL COMPANY 0 1 1 3 0 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 6
KAMYR INC. 0 0 0 0 0 0 0 2 1 2 0 0 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 6
LUMMUS COMPANY 3 1 0 0 0 0 0 0 0 0 0 2 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 6
MARATHON ASHLAND PETROLEUM LLC 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 1 2 2 0 0 0 0 0 6
PULLMAN, INCORPORATED 1 0 2 0 1 1 0 0 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 6
ROCKWELL INTERNATIONAL CORPORATION 0 0 0 0 1 0 0 0 1 0 0 0 0 0 0 0 0 1 1 1 0 0 0 0 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 6
SUMITOMO METAL INDUSTRIES CO., LTD. 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 1 2 1 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 6
WESTINGHOUSE ELECTRIC CORP. 0 0 1 0 0 2 0 0 0 0 0 0 0 2 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 6
FOSTER WHEELER ENERGIA OY 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 2 0 0 1 1 0 0 0 0 0 0 5
GULF OIL CORPORATION 0 0 0 0 0 0 0 5 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 5
INSTITUT FRANCAIS DU PETROLE 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 1 0 0 0 0 1 1 0 0 1 0 0 0 0 0 0 5
KOPPERS COMPANY INC. 0 0 0 0 0 0 0 1 0 0 0 1 1 2 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 5
L. C. STEINMULLER GMBH 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 4 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0 0 0 5
MILLENNIUM CELL, INC. 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 2 2 5
MOBIL OIL CORP. 0 1 1 0 0 0 0 0 1 0 0 0 0 0 1 0 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 5
NISSAN MOTOR COMPANY, LIMITED 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 2 1 5
PARSONS CORPORATION 0 0 0 0 0 0 0 2 1 1 0 0 0 0 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 5
RHEINISCHE BRAUNKOHLENWERKE AG 0 0 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 2 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 5
RUHRKOHLE AG 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 1 2 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 5
STEAG AKTIENGESELLSCHAFT 0 0 0 0 0 0 1 0 1 1 0 2 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 5
TOYO ENGINEERING CORPORATION 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 2 0 0 1 0 0 0 0 0 0 0 0 0 0 0 0 1 1 5


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