Westinghouse Brake and Signal Company Limited

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
4916516 Semiconductor contact arrangementExpiredNov 16, 88Apr 10, 90[H01L]
4901008 Circuit arrangement for testing the correct functioning of circuit(s)ExpiredSep 29, 88Feb 13, 90[G01R]
4860977 Railway signalling systemExpiredJul 21, 87Aug 29, 89[B61L]
4816960 Fail-safe output switching deviceExpiredMay 12, 87Mar 28, 89[H02M]
4777605 Method and apparatus for identifying the components of a signalExpiredJul 03, 86Oct 11, 88[G01R]
4768740 Vehicle tracking systemExpiredSep 02, 86Sep 06, 88[B61L]
4763290 Apparatus for performing a fast Fourier transformExpiredApr 24, 86Aug 09, 88[G06F]
4760895 Electric actuatorsExpiredApr 29, 87Aug 02, 88[B60T, F16D, F03G]
4742460 Vehicle protection systemExpiredMay 20, 85May 03, 88[B61L]
4735383 Communicating vital control signalsExpiredAug 04, 87Apr 05, 88[B61L]
RE32610 Electric actuatorsExpiredOct 30, 86Feb 23, 88[H02K]
4712128 Semiconductor devices having contact arrangementExpiredJul 15, 85Dec 08, 87[H01L]
4692867 Brake control systemExpiredJan 31, 85Sep 08, 87[B60T]
4672223 Proving safe operationExpiredJul 27, 84Jun 09, 87[B61L]
4651852 Electrically-controlled actuatorsExpiredMay 07, 84Mar 24, 87[B60K, B60T]
4652776 Circuit using a multi-path magnetic core with common output limbExpiredApr 10, 85Mar 24, 87[H03K]
4649329 Electric actuatorsExpiredApr 18, 85Mar 10, 87[H02K]
4644180 Actuator emergency operationExpiredNov 01, 85Feb 17, 87[H02J, F16D]
4641803 Track circuitExpiredJan 23, 85Feb 10, 87[B61L]
4636933 Power control circuit with digital pulse width controlExpiredJul 19, 85Jan 13, 87[H02M]

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