QUARTZ TECHNOLOGY INC.

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
2014/0374,325 Magnetic Separator and MethodAbandonedJun 24, 13Dec 25, 14[B03C]
4818510 Modified close fraction batch process for purification of SiO.sub.2ExpiredOct 21, 85Apr 04, 89[C07B]
4212661 Method for the manufacture of hollow fused quartz or fused silica ingotsExpiredFeb 16, 79Jul 15, 80[C03B]
4188201 Apparatus for forming an ingot in a rotating housingExpiredApr 17, 78Feb 12, 80[C03B]

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