148074 HOLDINGS CANADA LTD.,

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
4549273 Memory access control circuitExpiredDec 10, 82Oct 22, 85[G06F]
4530094 Coding for odd error multiplication in digital systems with differential codingExpiredSep 28, 82Jul 16, 85[G06F]
4498174 Parallel cyclic redundancy checking circuitExpiredAug 25, 82Feb 05, 85[G06F]
4487654 Method of manufacturing printed wiring boardsExpiredOct 27, 83Dec 11, 84[C25D, C23F, B44C]
4481490 Modulator utilizing high and low frequency carriersExpiredJun 07, 82Nov 06, 84[H03C]
4479256 Two pilot frequency control for communication systemsExpiredOct 04, 82Oct 23, 84[H04B]
4466130 Two pilot frequency control for communication systemsExpiredOct 04, 82Aug 14, 84[H04B]
4454600 Parallel cyclic redundancy checking circuitExpiredAug 25, 82Jun 12, 84[G06F]
4447903 Forward error correction using coding and redundant transmissionExpiredMay 22, 81May 08, 84[G06F]
4405897 Frequency deviation testing and adjusting system for frequency modulated oscillatorsExpiredMar 02, 81Sep 20, 83[G01R]
4399408 Apparatus for testing the linearity of a frequency modulated oscillatorExpiredMar 02, 81Aug 16, 83[G01R]
4398159 Switch mode - class B power amplifierExpiredMay 11, 81Aug 09, 83[H03F]
4388690 Automatic meter reading transponderExpiredOct 21, 80Jun 14, 83[H04Q, G01R]
4375621 Circuit for linearizing frequency modulated oscillators on microstripExpiredMar 02, 81Mar 01, 83[H03B, H03C]
4375698 Apparatus for testing microwave radios having 35 MHz if using test equipment designed for 70 MHz IFExpiredJul 20, 81Mar 01, 83[H04B]
4365346 Built-in linearity testing arrangement for an FM radio systemExpiredMar 02, 81Dec 21, 82[H04B]
4363131 Built-in group delay testing arrangement for an FM radio systemExpiredMar 02, 81Dec 07, 82[H04B]
4353039 Monolithic astable multivibrator circuitExpiredMay 15, 80Oct 05, 82[H03K, H03B]
4293902 Transformerless fast current limiter with symetry correction for a switched-mode power supplyExpiredDec 04, 79Oct 06, 81[H02P]
4245202 Floating gyrator having a current cancellation circuitExpiredJun 04, 79Jan 13, 81[H03H]

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