TDK ELECTRONICS CO., LTD.

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
D313605 Terminal fitted bobbinExpiredNov 02, 88Jan 08, 91[]
4890085 Terminal fitted bobbinExpiredOct 18, 88Dec 26, 89[H01F]
4673622 Magnetic recording mediumExpiredFeb 07, 84Jun 16, 87[B32B]
4654510 PTC heating apparatusExpiredOct 17, 79Mar 31, 87[H05B]
4638205 Piezo-electric transducerExpiredApr 27, 81Jan 20, 87[H01L]
4599718 Method for erasing a light recording mediumExpiredMar 08, 85Jul 08, 86[G11B]
4595901 Inductance device with bonded metal foil electrodesExpiredFeb 16, 84Jun 17, 86[H01F]
4593868 Reel spring of magnetic tape cassetteExpiredOct 13, 83Jun 10, 86[G11B]
4588654 Magnetic recording mediumExpiredMay 27, 82May 13, 86[H01F]
4587507 Core of a choke coil comprised of amorphous magnetic alloyExpiredNov 23, 82May 06, 86[H01F]
4563396 Magnetic recording mediumExpiredJun 03, 82Jan 07, 86[G11B]
4548910 Dielectric ceramic of BaO-TiO.sub.2 and SnO.sub.2ExpiredDec 10, 84Oct 22, 85[C04B]
4542062 Magnetic recording mediumExpiredJan 20, 82Sep 17, 85[G11B]
4533603 Magnetic recording mediumExpiredSep 17, 82Aug 06, 85[G11B]
4526837 Magnetic recording mediumExpiredApr 23, 82Jul 02, 85[G11B]
4520076 Magnetic recording mediumExpiredMay 14, 81May 28, 85[H01F]
4486498 Magnetic recording mediumExpiredSep 01, 83Dec 04, 84[B32B]
4485162 Magnetic carrier powder having a wide chargeable range of electric resistance useful for magnetic brush developmentExpiredFeb 08, 83Nov 27, 84[G03G]
4481881 Hot melt screen printing machineExpiredMay 16, 83Nov 13, 84[B41F]
4474326 Ultrasonic atomizing deviceExpiredNov 08, 82Oct 02, 84[B05B]

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