Passavant-Werke Michelbacher Huette

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
4396511 Cleaning apparatus for curved filter screensExpiredNov 12, 80Aug 02, 83[B01D]
4392952 Bar screen with screen cleaner for waste water treatment installationsExpiredApr 20, 81Jul 12, 83[C02C]
4388195 Process and apparatus for the chemical-mechanical treatment and purification of ground waters, surface waters and effluentsExpiredJul 05, 79Jun 14, 83[C02F]
4354947 Process for filtering sludge-like materials in a filter pressExpiredAug 04, 80Oct 19, 82[B01D]
4324655 Apparatus for treating wastewater with oxygenExpiredApr 24, 80Apr 13, 82[C02F]
4318670 Screw pump for conveying waste water and the likeExpiredJan 04, 80Mar 09, 82[F02C]
4305426 Apparatus for continuous constant discharge of liquid from a containerExpiredNov 20, 79Dec 15, 81[G05D]
4298359 Centrifugal separator having heat transfer meansExpiredJun 23, 80Nov 03, 81[B04C, B01D]
4285818 Process of treating wastewater with oxygenExpiredJun 11, 79Aug 25, 81[C02F]
4265171 Apparatus for conveying and dewatering wet coarse screenings debrisExpiredJul 26, 79May 05, 81[B30B]
4265749 Chamber filter pressExpiredOct 25, 79May 05, 81[B01D]
4209395 Process for slow softening waterExpiredSep 18, 78Jun 24, 80[C02B]

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