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

Patenting In Technology Classes,
Breakout By Organization

Count of 1969 - 2005 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 2005 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 2 184
WESTINGHOUSE AIR BRAKE COMPANY 4 8 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 0 82
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 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 0 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 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 2 25
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 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 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 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 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 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 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 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 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 0 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 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 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 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 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 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 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 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 0 7
NEW YORK AIR BRAKE 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 4 0 1 1 0 1 0 0 0 7
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 1 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 0 6
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 1 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 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 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 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 0 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 0 5


PTMB Contacts

Questions regarding these reports should be directed to:

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

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

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


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