DEUTSCHE PERLITE GMBH, A GERMAN CORP.

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
4822579 Device for the deacidification of waterExpiredSep 08, 87Apr 18, 89[C02F]
4512736 Apparatus for the expansion of mineral matter, especially perlite and vermiculiteExpiredDec 17, 82Apr 23, 85[F27B]
4310552 Casting perlite before the swineExpiredJun 26, 79Jan 12, 82[A23K]

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