KENNECOTT CORPORATION

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
4964993 Multiple-use molten metal filtersExpiredOct 16, 84Oct 23, 90[B01D]
4891067 Processes for the treatment of smelter flue dustExpiredMay 13, 88Jan 02, 90[C01G]
4798764 Arsenate dopant sources and method of making the sourcesExpiredJun 08, 83Jan 17, 89[B05D, B32B]
4790986 Method and apparatus to produce a hot fluidizing gasExpiredOct 15, 86Dec 13, 88[C01B]
4791077 Near net shape fused cast refractories and process for their manufacture by rapid melting/controlled rapid coolingExpiredFeb 04, 86Dec 13, 88[C04B]
4775393 Autogenous attrition grindingExpiredMay 30, 86Oct 04, 88[B24D]
4761025 Method and apparatus for distributing the load between sections of a vertical columnExpiredAug 07, 87Aug 02, 88[F16L]
4756895 Hexagonal silicon carbide platelets and preforms and methods for making and using sameExpiredAug 22, 86Jul 12, 88[C01B]
4749615 Semiconductor dopant sourceExpiredOct 31, 86Jun 07, 88[H01L, B32B]
4739974 Mobile holding furnace having metering pumpExpiredDec 04, 86Apr 26, 88[C22B, C21C]
4736789 Apparatus and method for continuous casting of metallic strands at exceptionally high speeds using an oscillating mold assemblyExpiredMar 19, 86Apr 12, 88[B22D]
4730239 Double layer capacitors with polymeric electrolyteExpiredOct 29, 86Mar 08, 88[H01G]
4711296 Apparatus for avoiding thermal stresses in glass lined vesselsExpiredNov 05, 84Dec 08, 87[F24H, B65D]
4701427 Sintered silicon carbide ceramic body of high electrical resistivityExpiredOct 17, 85Oct 20, 87[C04B, B29C, F22B]
4695294 Vibratory grinding of silicon carbideExpiredApr 11, 85Sep 22, 87[B24D]
4690790 Silicon nitride/silicon carbide composition and articles thereofExpiredJul 23, 85Sep 01, 87[C04B]
4683938 Method and apparatus for the continuous production of strip using oscillating mold assemblyExpiredFeb 03, 86Aug 04, 87[B22D]
4680899 Portable abrasive throwing wheel deviceExpiredDec 20, 85Jul 21, 87[B24C]
4678577 Seamless vessel for self contained filter assemblyExpiredAug 27, 85Jul 07, 87[B01D]
4660779 Multilayer precision wound filter cartridgeExpiredApr 22, 86Apr 28, 87[B65H, B01D]

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