Thann et Mulhouse

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
4786486 Stabilized zirconia particulatesExpiredMar 16, 87Nov 22, 88[C01G]
4261966 Process for the preparation of pigment grade iron oxides from ferrous sulphate and the resulting Fe.sub.2 O.sub.3 pigmentsExpiredOct 02, 79Apr 14, 81[C09C, C01G]
4206021 Process for the production of pigmentary titanium dioxide by the sulphuric acid methodExpiredFeb 27, 79Jun 03, 80[C25B]

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