Grefco, Inc.

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
5002696 Expanded mineral particles and apparatus and method of productionExpiredAug 01, 88Mar 26, 91[C03C, C04B]
4671973 Method for the treatment of mineral extender fillersExpiredSep 23, 85Jun 09, 87[B05D]
4521182 Method and apparatus for heating particulate materialExpiredJan 21, 82Jun 04, 85[C04B, F27B]
4313997 Perlite boards and method for making sameExpiredJul 14, 80Feb 02, 82[B32B]
4302344 Loose-fill, thermal insulationExpiredFeb 22, 80Nov 24, 81[C04B]
4255489 Perlite fillerExpiredMar 12, 79Mar 10, 81[C04B]
4212755 Settle resistant loose-fill perlite insulation comprising particles rendered slightly tacky by a coating thereonExpiredFeb 06, 78Jul 15, 80[C04B]
4187174 Diatomaceous earth filteraid and method for its manufactureExpiredDec 27, 78Feb 05, 80[B01D]
4183980 Perlite filler coated with polydimethylsiloxaneExpiredMar 14, 78Jan 15, 80[C04B]

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