S.N.F.

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Patent Activity in the Last 10 Years

Technologies

Intl Class Technology Matters Rank in Class
 
  
 
C08F MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS 1124

Top Patents (by citation)

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Recent Patents

Patent # Title Filing Date Issue Date Intl Class
5925714 Surfactant for self-inverting polyacrylmidesMar 04, 94Jul 20, 99[C08F]

Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
5750614 Process for preparing stable emulsions of polyelectrolytes of high molecular weight as reverse emulsionExpiredDec 01, 95May 12, 98[C08F]
5653946 Process for fluidifying aqueous suspensions of red muds in the production of alumina by the bayer processExpiredJul 14, 94Aug 05, 97[B01D]
5132383 Copolymers of 3-methacryloyloxy-2-hydroxypropyl trimethylammonium chloride monomer and vinyl monomerExpiredDec 26, 89Jul 21, 92[C08F]
5019275 Method of flocculation with cationic terpolymer flocculantsExpiredAug 15, 90May 28, 91[C02F]
5008319 Homogeneous mixtures of solid organic acids and solid cationic ester-based polymer flocculantsExpiredFeb 01, 90Apr 16, 91[C08K]
5008444 Process for the production of substituted acryloyloxyhydroxypropyltrialkylammonium chlorideExpiredDec 26, 89Apr 16, 91[C07C]
4988442 Process for dewatering of biological sludgeExpiredNov 07, 88Jan 29, 91[C02F]
4981936 Terpolymer of oxyalkyene acrylates, acrylamides and quaternary monomersExpiredApr 14, 89Jan 01, 91[C08F]
4888396 Novel cationic acrylamide polymers and processes for their preparationExpiredJun 08, 88Dec 19, 89[C08F]
4808668 Carboxylate polymers and processes for their preparation and useExpiredOct 23, 86Feb 28, 89[C08F]
4782900 Aminoalkylated polyacrylamide aldehyde gels, their preparation and use in oil recoveryExpiredApr 24, 87Nov 08, 88[E21B]
4783513 Novel water soluble cationic acrylamide polymers having relatively uniform cationic quaternary amine functional unit distributionExpiredApr 10, 87Nov 08, 88[C08F]
4777218 Cationic nitrogen acrylamide polymersExpiredFeb 11, 87Oct 11, 88[C08F]
4707281 Drilling fluid additive containing high pyruvate xanthanExpiredJun 03, 85Nov 17, 87[C09K]
4668747 Preparation of water soluble cationic acrylamide polymer and product using weak acid to adjust pHExpiredAug 02, 85May 26, 87[C08F]
4650827 Stable water-in-oil emulsionsExpiredNov 02, 83Mar 17, 87[C08F]
4639322 Biopolymer compositions having enhanced filterabilityExpiredAug 27, 84Jan 27, 87[E21B]
4617362 Inverse emulsion polymers with improved incorporation of diallyldimethylammonium chlorideExpiredMay 16, 85Oct 14, 86[C08F]
4594452 Process for the preparation of anhydrous N-(3-chloro-2-hydroxypropyl) trialkylammonium saltsExpiredJun 24, 85Jun 10, 86[C07C]
4492788 Partially deacylated ultra-high molecular weight poly(N-propionylethylenimines)ExpiredJan 03, 83Jan 08, 85[C08G]

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