DIDIER-WERKE A.G., A CORP. OF THE FED. REP. OF GERMANY

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
4659435 Integrally heated electrochemical cell method and apparatusExpiredAug 09, 85Apr 21, 87[G01N]
4659680 Stabilized zirconia bodies of improved toughnessExpiredAug 20, 84Apr 21, 87[C04B]
4644138 Temperature control system with simplified controller and power supplyExpiredApr 25, 83Feb 17, 87[H05B]
4621936 Zirconia pen ballsExpiredOct 14, 83Nov 11, 86[B43K, C04B]
4461843 Processes for preparing novel baddeleyite refractory articlesExpiredSep 09, 82Jul 24, 84[C04B]
4362580 Furnace and method with sensorExpiredApr 06, 81Dec 07, 82[C21D]
4290586 Furnace and method with sensorExpiredFeb 04, 80Sep 22, 81[C21B]
4277322 Oxygen sensorExpiredFeb 04, 80Jul 07, 81[G01N]
4198279 Oxygen sensor mounting structureExpiredNov 10, 77Apr 15, 80[G01N]
4186072 Hot gas measuring deviceExpiredJun 12, 78Jan 29, 80[G01N]

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