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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 246, Railway Switches and Signals

( 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 8 5 7 8 7 5 4 5 1 10 2 3 4 1 2 2 1 2 2 5 2 1 3 3 5 5 11 4 6 11 2 10 12 8 10 5 182
WESTINGHOUSE AIR BRAKE COMPANY 4 7 11 8 7 7 4 7 7 4 2 2 0 0 0 0 0 0 0 0 0 0 0 1 1 0 0 1 1 4 2 0 0 1 0 0 81
GENERAL SIGNAL CORPORATION 6 4 9 7 7 5 6 6 5 5 2 0 1 3 0 1 1 3 2 2 2 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 78
UNION SWITCH & SIGNAL INC. 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 4 5 2 8 6 5 0 4 2 6 4 1 48
WESTINGHOUSE ELECTRIC CORP. 0 2 1 2 6 2 2 9 2 0 0 0 2 2 2 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 33
GENERAL ELECTRIC COMPANY 7 1 2 2 1 2 0 1 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 0 1 1 3 23
AMERICAN STANDARD, INC. 0 0 0 0 0 0 0 0 0 0 0 0 4 3 4 1 3 1 1 4 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 21
ABEX CORPORATION 5 0 2 1 2 0 1 0 1 2 0 0 1 1 0 1 0 1 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 19
ABC RAIL PRODUCTS CORPORATION 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 1 4 3 4 0 2 1 0 0 0 18
VOEST-ALPINE EISENBAHNSYSTEMS 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 2 1 1 3 1 0 1 2 2 3 2 0 18
HARMON INDUSTRIES, INC. 0 0 0 0 0 1 0 1 1 0 0 0 0 0 0 0 0 0 0 0 0 2 1 2 0 1 1 2 2 1 1 0 0 0 0 0 16
BRITISH RAILWAYS BOARD 0 0 1 2 0 4 2 1 0 0 0 0 0 0 0 0 1 0 0 0 1 1 0 0 1 0 0 0 0 0 0 0 0 0 0 0 14
SERVO CORPORATION OF AMERICA 1 0 2 0 1 1 1 1 0 1 0 0 1 2 1 0 0 0 1 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0 0 0 14
INTERNATIONAL STANDARD ELECTRIC CORPORATION (ITT CORP. UNIT) 0 0 0 0 0 0 0 0 4 2 3 0 0 1 1 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 12
SIEMENS AKTIENGESELLSCHAFT 0 0 0 0 0 0 0 1 1 2 0 0 0 1 1 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 0 2 1 1 1 12
ELEKTRO-THERMIT GMBH 0 0 0 1 4 1 1 0 0 0 1 1 0 0 0 0 0 1 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 11
GENERAL RAILWAY SIGNAL COMPANY 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 2 2 2 0 3 2 0 0 0 0 0 0 0 11
WESTINGHOUSE BRAKE AND SIGNAL CO. LIMITED 0 0 0 0 0 1 1 0 0 0 0 1 3 0 0 0 1 0 1 2 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 11
SAFETRAN SYSTEMS CORPORATION 0 0 0 0 0 0 0 2 0 0 0 0 0 0 3 0 0 0 1 0 0 1 2 0 0 0 0 0 0 0 0 0 0 0 0 0 9
BWG BUTZBACHER WEICHENBAU GMBH 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 3 0 2 1 0 0 0 0 0 0 1 0 8
HITACHI, LTD 0 0 0 0 0 0 0 0 1 1 0 0 0 0 1 0 0 0 0 0 0 0 1 0 0 1 0 1 0 1 0 0 0 0 0 0 7
KABUSHIKI KAISHA MARUTO SEISAKUSHO 0 0 0 0 0 0 0 0 0 2 1 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 7
MESSERSCHMITT-BOLKOW-BLOHM GMBH 0 0 0 0 0 3 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 7
NEW YORK AIR BRAKE COMPANY 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 4 0 1 1 0 1 0 0 7
MITSUBISHI DENKI KABUSHIKI KAISHA 0 0 0 0 0 1 0 0 0 0 0 0 0 0 0 0 0 0 1 0 1 1 0 0 0 0 1 0 0 0 0 0 1 0 0 0 6
WESTINGHOUSE BRAKE & SIGNAL HOLDINGS 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 2 2 0 0 0 1 1 0 0 0 0 6
JAPANESE NATIONAL RAILWAYS 0 0 0 0 1 0 2 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 0 0 5
PULLMAN, INCORPORATED 0 3 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 0 0 0 0 0 0 0 5
PULSE ELECTRONICS, INC. 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 1 0 0 0 0 0 0 0 0 5
SOUTHERN PACIFIC TRANSPORTATION CO. 0 0 0 1 2 0 0 1 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 5
VAE NORTRAK NORTH AMERICA, 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 1 0 1 0 0 1 2 5
VOEST-ALPINE MASCHINENBAU 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 3 2 0 0 0 0 0 0 0 0 0 0 0 0 0 5


PTMD Contacts

Questions regarding these reports should be directed to:

U.S. Patent and Trademark Office
Office of Electronic Information Products - PTMD
MDW 4C18; P.O Box 1450
Alexandria VA 22313-1450

tel: (571) 272-5600
fax: (571) 273-0110
email: oeip@uspto.gov

address of PTMD pages at the USPTO Web Site: http://www.uspto.gov/web/offices/ac/ido/oeip/taf/tafp.html
ftp download of selected PTMD reports and materials from : ftp.uspto.gov/pub/taf/


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