Takeda Riken Kogyo Kabushikikaisha

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
4835535 Digital-to-analog converting apparatus equipped with calibrating functionExpiredMar 06, 87May 30, 89[H03K]
4719365 Clocked logic delay device which corrects for the phase difference between a clock signal and an input binary signalExpiredDec 24, 84Jan 12, 88[H03K]
4713788 Burst signal generatorExpiredAug 28, 84Dec 15, 87[G10H, G06F]
4701918 Logic analyzerExpiredMay 24, 85Oct 20, 87[G06F, G01R]
4696004 Logic analyzerExpiredMay 24, 85Sep 22, 87[G06F]
4680540 Device for measuring average frequenciesExpiredJul 11, 84Jul 14, 87[G01R]
4670879 Pattern generatorExpiredFeb 15, 85Jun 02, 87[G06F]
4654848 Multi-trigger logic analyzerExpiredApr 02, 85Mar 31, 87[G06F]
4631724 Semiconductor memory test equipmentExpiredMay 15, 85Dec 23, 86[G01R]
4623845 Multi-clock generatorExpiredFeb 12, 85Nov 18, 86[H03K]
4611926 Time interval measuring instrumentExpiredOct 02, 84Sep 16, 86[G04F]
4607216 Apparatus for measurement by digital spectrum analyzerExpiredSep 25, 84Aug 19, 86[G01R]
4600994 Phase difference measuring apparatusExpiredOct 04, 83Jul 15, 86[G01R]
4539518 Signal generator for digital spectrum analyzerExpiredSep 19, 83Sep 03, 85[G01R]
4523288 Interval-expanding timerExpiredMar 10, 82Jun 11, 85[G04F]
4523312 IC testerExpiredOct 21, 82Jun 11, 85[G06F, G01R]
4513256 Swept frequency signal generatorExpiredJun 29, 83Apr 23, 85[H03L, H03B]
4497056 IC TesterExpiredAug 13, 82Jan 29, 85[G01R]
4488123 Frequency synthesizerExpiredDec 16, 81Dec 11, 84[H03L]
4486750 Data transfer systemExpiredMay 14, 82Dec 04, 84[H04Q]

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