Racal Research Limited

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
6020836 Sigma-delta analogue-to-digital conversion circuitsExpiredJun 24, 97Feb 01, 00[H03M]
5377221 Communications systemExpiredMay 10, 85Dec 27, 94[H04K]
4773092 Speech scramblersExpiredOct 24, 86Sep 20, 88[H04K]
4748655 Portable telephonesExpiredJul 24, 85May 31, 88[H04Q]
4626859 Direction finding systemsExpiredSep 28, 84Dec 02, 86[G01S]
4442527 Synchronization systemsExpiredDec 18, 81Apr 10, 84[H04L]
4387963 Temperature compensation for a liquid crystal display via capacitance compensation of the liquid crystal materialExpiredOct 14, 80Jun 14, 83[G02F]
4367444 Frequency discriminator and frequency modulator incorporating such discriminatorExpiredOct 20, 80Jan 04, 83[H03L, H03D]
4340963 Methods and systems for the correction of errors in data transmissionExpiredNov 10, 80Jul 20, 82[G06F]

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