Paper Technology Foundation, Inc.

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Patent Activity in the Last 10 Years

Technologies

Intl Class Technology Matters Rank in Class
 
  
 
D21C PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE- CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR226

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Recent Publications

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Recent Patents

Patent # Title Filing Date Issue Date Intl Class
5213660 Secondary fiber cellulose product with reduced levels of polychlorinated dibenzodioxins and polychlorinated dibenzofuransFeb 28, 91May 25, 93[D21C]
5074958 Method for removing polychlorinated dibenzodioxins and polychlorinated dibenzofurans and stickies from secondary fibers using supercritical propane solvent extractionApr 15, 91Dec 24, 91[D21C]

Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
6821387 Use of fractionated fiber furnishes in the manufacture of tissue products, and products produced therebyExpiredMay 23, 02Nov 23, 04[D21H]
6746573 Method of drying fibrous structuresExpiredAug 14, 01Jun 08, 04[F26B, D21F]
6623806 Methods for the reduction of bleeding of lignosulfonates from lignosulfonate-treated substratesExpiredAug 02, 02Sep 23, 03[B05D]
6620461 Methods for the reduction of bleeding of lignosulfonates from lignosulfonate-treated substratesExpiredAug 02, 02Sep 16, 03[B05D]
6537615 Steam-assisted paper impregnationExpiredNov 12, 98Mar 25, 03[B05D]
6537616 Stam-assisted paper impregnationExpiredJan 19, 99Mar 25, 03[B05D]
2002/0139,494 Recovery of fibers from a fiber processing waste sludgeAbandonedApr 15, 02Oct 03, 02[D21C]
6458419 Methods for the reduction of bleeding of lignosulfonates from lignosulfonate-treated substratesExpiredAug 06, 01Oct 01, 02[B05D]
2002/0084,045 COMPOSITIONS FOR IMPROVING PHYSICAL STRENGTH PROPERTIES AND HUMIDITY RESISTANCE OF PAPER PRODUCTSAbandonedNov 12, 98Jul 04, 02[D21C]
6372085 Recovery of fibers from a fiber processing waste sludgeExpiredDec 18, 98Apr 16, 02[D21C]
6281350 Methods for the reduction of bleeding of lignosulfonates from lignosulfonate-treated substratesExpiredDec 17, 99Aug 28, 01[C08B]
6260511 Process for the preparation of absorbent materialsExpiredJan 24, 96Jul 17, 01[A01K]
6211357 Strengthening compositions and treatments for lignocellulosic materialsExpiredDec 09, 99Apr 03, 01[B05D]
6194057 Partially impregnated lignocellulosic materialsExpiredNov 12, 98Feb 27, 01[B32B]
6146498 Wound product cores and processes for making themExpiredApr 30, 97Nov 14, 00[D21F]
6114471 Strengthening compositions and treatments for lignocellulosic materialsExpiredNov 12, 98Sep 05, 00[C08G, C08F]
6080266 Fractionation process for cellulosic fibersExpiredOct 01, 99Jun 27, 00[A61F, B32B]
6024834 Fractionation process for cellulosic fibersExpiredDec 17, 96Feb 15, 00[D21H]
5932182 Reactor for high temperature, elevated pressure, corrosive reactionsExpiredFeb 23, 98Aug 03, 99[B01J]
5858021 Treatment process for cellulosic fibersExpiredSep 26, 97Jan 12, 99[D06M]

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