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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 1969 - 2004 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 373, Industrial Electric Heating Furnaces

( 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 Total
~Individually Owned Patent 13 7 10 17 18 21 11 9 16 9 10 11 5 4 2 9 3 3 4 5 3 4 3 5 5 3 4 3 0 0 7 12 6 6 3 3 254
ASEA AKTIEBOLAG 1 2 0 0 1 7 7 8 6 5 6 4 1 3 3 8 5 8 2 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 78
OWENS-CORNING FIBERGLAS CORPORATION 0 0 0 0 0 4 0 5 1 1 0 3 5 5 5 5 4 2 3 0 3 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 46
MANNESMANN AG 0 0 0 0 0 0 0 0 0 0 0 0 0 0 2 2 0 5 2 3 0 5 2 1 1 2 2 6 1 3 1 0 0 0 0 0 38
WESTINGHOUSE ELECTRIC CORP. 4 5 6 3 2 2 0 0 0 2 3 0 1 0 0 1 4 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 33
DANIELI & CO. OFFICINE MECCANICHE SPA 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0 2 0 2 0 1 5 6 5 6 1 1 0 30
INDUCTOTHERM INDUSTRIES INC. 0 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 2 0 0 0 1 1 3 0 2 0 0 2 3 1 0 1 3 4 24
LEYBOLD-HERAEUS GMBH 1 2 1 2 1 0 1 0 1 2 0 1 2 1 1 2 1 0 1 3 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 24
AIRCO INC. 3 3 4 2 3 0 1 0 2 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 19
BBC BROWN, BOVERI & COMPANY, LIMITED 0 0 0 0 0 0 1 0 1 0 1 0 1 2 0 5 0 6 2 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 19
DAIDO TOKUSHUKO, K.K. 0 0 0 0 0 0 0 0 1 0 1 0 1 1 0 0 0 1 3 1 0 0 0 0 2 0 0 1 2 1 0 1 0 0 0 0 16
GENERAL ELECTRIC COMPANY 0 1 0 1 0 0 0 1 0 1 2 0 0 0 0 0 0 0 1 0 0 3 0 0 0 0 0 0 0 1 0 2 3 0 0 0 16
UNION CARBIDE CORPORATION 1 2 0 1 1 0 0 0 1 0 0 0 0 2 0 2 0 0 2 0 4 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 16
AJAX MAGNETHERMIC CORPORATION 3 0 2 1 0 2 0 0 1 0 1 0 0 0 0 0 0 0 0 0 1 0 0 0 0 1 0 0 1 0 1 1 0 0 0 0 15
CORNING INCORPORATED 0 1 0 2 1 1 0 0 1 0 1 0 0 1 1 1 0 2 0 2 0 0 0 0 0 0 1 0 0 0 0 0 0 0 0 0 15
ISHIKAWAJIMA-HARIMA HEAVY INDUSTRIES CO., LTD. 0 0 2 0 0 1 0 1 1 1 1 2 0 0 0 1 1 1 2 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0 0 15
VOEST-ALPINE AKTIENGESELLSCHAFT 0 0 0 0 0 0 0 0 0 0 0 0 0 0 3 2 2 2 2 2 2 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 15
ARC TECHNOLOGIES SYSTEMS, LTD. 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 7 3 1 3 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 14
INSTITUTE DE RECHERCHES DE LA SIDERURGIE FRANCAISE (IRSID) 0 0 0 1 0 0 0 0 0 3 0 1 0 1 0 1 1 1 2 0 0 0 2 1 0 0 0 0 0 0 0 0 0 0 0 0 14
UCAR CARBON TECHNOLOGY CORPORATION 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 3 0 1 1 1 2 1 2 1 0 0 1 1 14
BRITISH STEEL CORPORATION 0 0 0 0 3 3 0 1 0 0 1 0 1 1 0 1 1 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 13
FRIED. KRUPP HUTTENWERKE AG 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 3 0 0 7 2 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 13
ELKEM-SPIGERVERKET A/S 0 0 0 1 1 0 1 3 2 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 12
LECTROMELT CORPORATION 0 1 0 0 0 0 0 2 0 1 3 0 0 2 0 2 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 12
SIEMENS AKTIENGESELLSCHAFT 0 1 0 1 1 0 0 1 0 2 0 0 0 3 0 1 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 0 0 12
COMMISSARIAT A L'ENERGIE ATOMIQUE 1 0 1 1 0 1 0 0 1 1 0 0 0 0 0 0 0 1 1 0 1 0 0 0 0 1 0 0 0 0 0 0 1 0 0 0 11
GREAT LAKES CARBON CORPORATION 0 0 0 0 0 1 0 0 0 0 1 0 0 0 3 3 1 0 0 0 1 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 11
DOW CHEMICAL COMPANY 0 2 3 1 2 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 0 0 0 1 0 0 0 0 0 0 0 0 0 10
FUJI ELECTRIC CO., LTD. 0 0 0 0 0 0 0 0 0 0 0 1 0 0 1 0 0 0 0 0 0 0 1 0 2 0 1 1 1 1 1 0 0 0 0 0 10
INSTITUT ELEKTROSVARKI IMENI E.O. PATONA AKADEMII NAUK UKRAI 0 0 0 1 2 5 0 0 0 0 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 10
PENNSYLVANIA ENGINEERING CORPORATION 0 0 0 0 1 2 0 1 1 0 0 0 0 0 0 0 0 3 2 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 10
SORG GMBH + CO. KG 0 0 0 0 0 0 0 0 1 2 1 1 0 0 0 0 0 0 0 1 2 2 0 0 0 0 0 0 0 0 0 0 0 0 0 0 10
CLECIM S. A. 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 1 0 0 2 0 0 0 1 0 1 3 0 0 0 0 0 0 0 0 9
ELKEM A/S 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 6 1 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 9
GEBRUDER BUHLER AG 1 1 3 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 9
KNAPSACK AKTIENGESELLSCHAFT 0 1 4 3 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 9
LEYBOLD AKTIENGESELLSCHAFT 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 2 1 2 1 3 0 0 0 0 0 0 0 0 0 0 0 9
NIPPON STEEL CORP. 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 3 0 0 0 0 1 0 0 0 0 0 0 2 0 0 1 1 0 9
SANDIA 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 2 0 1 1 2 1 1 0 1 0 0 9
WOODING CORPORATION 0 0 0 0 0 0 0 0 1 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 9
LEYBOLD DURFERRIT GMBH 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 3 1 3 1 0 0 0 0 0 0 0 0 8
ABAR CORPORATION 1 0 0 0 0 1 0 0 0 0 0 2 2 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 7
ASEA BROWN BOVERI LTD. 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 3 2 2 0 0 0 0 0 0 0 0 0 0 7
DAIDO SEIKO KABUSHIKI KAISHA 0 0 0 0 1 4 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 0 0 0 0 7
DIDIER-WERKE A.G. 0 0 0 0 0 1 0 0 0 0 0 0 0 0 0 1 0 0 1 0 1 0 0 0 1 0 0 0 0 0 0 1 1 0 0 0 7
FUCHS SYSTEMS, INC. 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 4 2 0 0 0 0 7
FUCHS SYSTEMTECHNIK GMBH 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 3 3 0 0 0 0 1 0 0 0 0 0 0 0 0 0 0 0 0 7
NKK CORPORATION 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 3 1 0 1 1 0 0 0 1 0 0 0 0 7
OUTOKUMPU OYJ 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 3 1 2 0 0 0 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 7
SCHOTT GLASWERKE 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 0 0 3 1 2 7
SHINKO ELECTRIC CO., LTD. 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 1 2 2 0 7
ALLEGHENY LUDLUM STEEL CORPORATION 2 1 2 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 0 6
ASSOCIATED ELECTRICAL INDUSTRIES LIMITED 2 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 6
BTU ENGINEERING CORPORATION 0 0 0 0 1 0 0 2 1 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 0 0 6
ELKEM ASA 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 1 1 2 0 0 0 6
ISHIKAWAJIMA HARIMA JUKOGYO KABUSHIKI KAISHA 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 3 1 0 0 1 0 0 0 0 6
JERSEY NUCLEAR-AVCO ISOTOPES, INC. 0 0 0 0 0 0 0 0 2 0 1 0 1 0 0 1 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 6
KORF-STAHL AG. 0 0 0 0 0 0 0 0 0 1 1 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 6
LECO CORPORATION 0 0 0 0 0 0 1 1 1 0 0 0 0 1 2 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 6
NORTON COMPANY 1 0 0 1 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 2 0 0 0 0 0 0 0 0 0 0 0 0 6
SOLA BASIC INDUSTRIES INC. 0 0 0 1 1 1 0 1 1 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
UNITED STATES OF AMERICA, DEPARTMENT OF ENERGY 0 0 0 0 1 0 0 1 1 0 0 0 0 0 0 0 1 1 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0 0 0 0 6
VOEST-ALPINE INDUSTRIEANLAGENBAU GESELLSCHAFT M.B.H. 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 0 1 2 0 0 0 0 0 0 6
AMSTED INDUSTRIES, INCORPORATED 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 2 1 1 0 0 0 5
ASEA BROWN BOVERI AB 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 1 0 0 0 0 0 1 0 0 1 0 1 0 0 0 5
C. CONRADTY NURNBERG GMBH + CO. KG 0 0 0 0 0 0 0 0 0 1 0 0 0 0 1 1 0 0 1 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 5
DEUTSCHE VOEST-ALPINE INDUSTRIEANLAGENBAU GMBH 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 1 0 0 0 0 0 0 0 0 0 5
HATCH ASSOCIATES LIMITED 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 0 0 0 1 0 0 1 1 0 5
JOHNS-MANVILLE CORPORATION 1 1 0 0 0 0 0 1 0 0 1 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
L'AIR LIQUIDE, SOCIETE ANONYME POUR L'ETUDE ET L'EXPLOITATION DES PROCEDES GEORGES CLAUDE 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 1 0 0 0 1 0 1 1 0 0 0 5
MAN GUTEHOFFNUNGSHUTTE GMBH 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 3 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 5
NATIONAL RESEARCH INSTITUTE FOR METALS 0 0 0 0 0 0 1 1 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 2 0 0 0 0 0 0 0 0 0 5
PPG INDUSTRIES INC. 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0 1 2 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 5
SIGRI GMBH 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 4 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 5
SMS DEMAG AKTIENGESELLSCHAFT 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 3 0 2 5
TANABE KOKOKI CO., LTD. 0 0 0 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 0 0 0 0 0 0 0 5
TOLEDO ENGINEERING CO., INC. 0 0 0 1 2 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0 0 0 0 0 0 5
USX CORPORATION 0 0 1 0 1 1 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 0 0 0 0 0 5


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