Grefco, Inc.
Patent Owner
Stats
- 0 US PATENTS IN FORCE
- 0 US APPLICATIONS PENDING
- Mar 26, 1991 most recent publication
Details
- 0 Issued Patents
- 0 Issued in last 3 years
- 0 Published in last 3 years
- 140 Total Citation Count
- Feb 06, 1978 Earliest Filing
- 9 Expired/Abandoned/Withdrawn Patents
Patent Activity in the Last 10 Years
Technologies
- No Technology to Display
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Recent Publications
- No Recent Publications to Display
Recent Patents
- No Recent Patents to Display
Expired/Abandoned/Withdrawn Patents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]
4521182 Method and apparatus for heating particulate materialExpiredJan 21, 82Jun 04, 85[C04B, F27B]
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]
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