I. KRUGER INC.

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Patent Activity in the Last 10 Years

Technologies

Intl Class Technology Matters Rank in Class
 
  
 
C02F TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE 847

Top Patents (by citation)

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Recent Publications

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Recent Patents

Patent # Title Filing Date Issue Date Intl Class
8956539 System and method for drying biosolids and enhancing the value of dried biosolidsMar 09, 13Feb 17, 15[C05F, C02F]
8147695 Method of removing phosphorus from wastewaterOct 26, 10Apr 03, 12[C02F]
7828976 Method of removing phosphorus from wastewaterJun 22, 07Nov 09, 10[C02F]
7323108 Combined biological and ballasted flocculation process for treating wastewaterApr 17, 07Jan 29, 08[C02F]
7147778 Method and system for nitrifying and denitrifying wastewaterJan 05, 06Dec 12, 06[C02F]
6919031 Method of treating water and wastewater with a ballasted flocculation process and a chemical precipitation processNov 02, 01Jul 19, 05[C02F]
5536407 Nitrification and denitrification wastewater treatment processFeb 21, 95Jul 16, 96[C02F]
RE32429 Production of non-bulking activated sludgeMar 26, 84Jun 02, 87[C02F]

Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
7459083 Method for controlling fouling of a membrane filterExpiredMay 07, 07Dec 02, 08[C02F]
2006/0108,273 Ballasted flocculation process and system incorporating an electro-coagulation reactor for treating water or wastewaterAbandonedFeb 04, 05May 25, 06[B01D]
6197190 Tapered flocculation water treatmentExpiredApr 07, 99Mar 06, 01[B01D]
5213681 Method for biologically removing nitrogen from wastewaterExpiredSep 09, 91May 25, 93[C02F]
5182021 Biological process for enhanced removal of ammonia, nitrite, nitrate, and phosphate from wastewaterExpiredDec 16, 91Jan 26, 93[C02F]
5160043 Method of exhausting dissolved oxygen in a nitrogen removal wastewater treatment processExpiredSep 09, 91Nov 03, 92[C02F]
4731185 Biological wastewater treating systemExpiredJul 12, 83Mar 15, 88[C02F]
4650585 Method for minimizing diurnal swing in phosphorus content of effluent streams from wastewater treating plantsExpiredApr 17, 84Mar 17, 87[C02F]
4556491 Avoidance of rising sludge in biological wastewater treatment clarifiersExpiredDec 03, 84Dec 03, 85[C02F]
4552663 Process for the removal of ammoniacal nitrogen in the BOD sorption zone of a wastewater treatment plantExpiredJul 31, 84Nov 12, 85[C02F]
4522722 Nitrogen and phosphorus removal from wastewaterExpiredMar 07, 83Jun 11, 85[C02F]
4488967 Treatment of wastewater containing phosphorus compoundsExpiredMar 07, 83Dec 18, 84[C02F]
4488968 Removal of phosphates and BOD from wastewatersExpiredMar 07, 83Dec 18, 84[C02F]
4271026 Control of activated sludge wastewater treating process for enhanced phosphorous removalExpiredOct 09, 79Jun 02, 81[C02F]
4257897 Process for reabsorption and retention of phosphorous by activated biomassExpiredOct 26, 79Mar 24, 81[C02C]

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