PPG Industries Canada, Ltd.

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
4536418 Method for treating potash with anticaking agentExpiredApr 22, 82Aug 20, 85[B05D]
4386936 Production of potassium chloride using pond crystallizationExpiredFeb 01, 79Jun 07, 83[B01D]
4385902 Process for purifying crystalline potassium chlorideExpiredJun 24, 80May 31, 83[B01J, B01D]
4290650 Subterranean cavity chimney development for connecting solution mined cavitiesExpiredAug 03, 79Sep 22, 81[E21B]
4284306 Apparatus and method of mining subterranean rubble pilesExpiredJul 16, 79Aug 18, 81[E21B]
4276117 Process of treating potassium chloride brine by evaporation and crystallizationExpiredMay 22, 80Jun 30, 81[B01D]
4264104 Rubble miningExpiredJul 16, 79Apr 28, 81[E21B]
4239287 Solution mining potassium chloride from heated subterranean cavitiesExpiredFeb 01, 79Dec 16, 80[E21C]
4239288 Solution mining method utilizing sub-surface aquiferExpiredFeb 01, 79Dec 16, 80[E21B]
4231840 Method of concentrating an aqueous solution by multiple effect evaporatingExpiredFeb 01, 79Nov 04, 80[B01D]
4224035 Method of separating salts from solutionExpiredApr 03, 78Sep 23, 80[B01D]
4224036 Method of concentrating salt solutionsExpiredApr 03, 78Sep 23, 80[B01D]
4224037 Method for operating multiple effect evaporatorsExpiredApr 03, 78Sep 23, 80[B01D]
4192555 Method of disposing solid sodium chloride while selectively solution mining potassium chlorideExpiredAug 22, 78Mar 11, 80[E21B]

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