HMC PATENTS HOLDING CO., INC.

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
4844880 Process for the manufacture of sodium metabisulfiteExpiredDec 27, 85Jul 04, 89[C01B, C01D]
4804464 System for in situ upgrading of the purity of a liquid and flushing a filtration systemExpiredApr 26, 85Feb 14, 89[B01D]
4791043 Positive photoresist stripping compositionExpiredApr 17, 87Dec 13, 88[G03C]
4743439 Wet calcination of alkali metal bicarbonates in hydrophobic mediaExpiredJan 16, 84May 10, 88[C01D]
4659556 Single step purification of sulfur dioxide gas prepared by the combustion of sulfur containing compoundsExpiredMar 04, 83Apr 21, 87[C01B]
4643825 Bulk container system for high purity liquidsExpiredDec 06, 84Feb 17, 87[B01D]
4643887 Production of sulfur trioxide, sulfuric acid and oleumExpiredAug 26, 82Feb 17, 87[C01B]
4620934 Soluble fluorinated cycloalkane sulfonate surfactant additives for NH.sub.4ExpiredMay 13, 85Nov 04, 86[C09K, C03C, B44C]
4538921 Apparatus and method for slurrying soda ashExpiredNov 25, 83Sep 03, 85[B01F]
4517106 Soluble surfactant additives for ammonium fluoride/hydrofluoric acid oxide etchant solutionsExpiredApr 26, 84May 14, 85[C09K, C03C, B44C]
4491530 Brown stain suppressing phenol free and chlorinated hydrocarbons free photoresist stripperExpiredMay 20, 83Jan 01, 85[B08B, C11D]
4431037 Low particulate liquid filling machine and methodExpiredDec 28, 81Feb 14, 84[B65B]
4426311 Methylene chloride-methane sulfonic acid stripping compositions and methods for using sameExpiredDec 23, 81Jan 17, 84[C11D]
4417996 Aqueous basic polyaluminum-iron halide solutionsExpiredSep 16, 82Nov 29, 83[C02B, C01G, C01F]
4332778 Non-evaporative process for the production of aluminum sulfateExpiredJun 30, 80Jun 01, 82[C22B, C01G, C01F]
4286967 Double crystallization process to produce low organic, low silica soda ashExpiredJun 27, 80Sep 01, 81[C30B]
4285923 Manufacture of calcium nitrite solutions with low nitrate contentExpiredNov 15, 78Aug 25, 81[C01B]
4285925 Process for the conversion of light ash to absorptive low bulk density alkali productsExpiredAug 16, 78Aug 25, 81[C01D]
4284611 Aqueous phosphate-stabilized polyaluminum sulfate solutions and preparation thereofExpiredJul 25, 79Aug 18, 81[C01B]
4279279 Filling machine and method for low particulate chemicalsExpiredOct 05, 79Jul 21, 81[B65B]

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