PERLITE, INC.

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
4557883 Preparation and expansion of perlite ore finesExpiredFeb 05, 82Dec 10, 85[B29H]
4347155 Energy efficient perlite expansion processExpiredMar 19, 81Aug 31, 82[C04B, F27B]
4290749 Perlite expansion process and apparatus thereforExpiredOct 23, 78Sep 22, 81[F27B]
4186306 Perlite expansion density control systemExpiredDec 02, 77Jan 29, 80[G01M]

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