The Lemna Corporation

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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 253

Top Patents (by citation)

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Recent Publications

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Recent Patents

Patent # Title Filing Date Issue Date Intl Class
6136194 Method and device for treating wastewaterJan 19, 99Oct 24, 00[C02F]
5861095 Method and device for treating wastewaterApr 09, 97Jan 19, 99[C02F]

Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
5736047 Hybrid biological nutrient removal systemExpiredMay 04, 95Apr 07, 98[C02F]
5534141 Wastewater treatment system with in-pond clarifierExpiredDec 09, 94Jul 09, 96[B01D]
5421999 Floating nitrification reactor in a treatment pondExpiredJul 25, 94Jun 06, 95[C02F]
5409601 Floating aquatic plant treatment systemExpiredJul 06, 93Apr 25, 95[C02F]
5342512 Floating aquatic plant treatment system with porous systemExpiredFeb 11, 93Aug 30, 94[C02F]
5338452 High rate anaerobic reactor for primary treatment of high strength wastewaterExpiredJan 14, 93Aug 16, 94[C02F]
5264127 Floating aquatic plant water treatment system with sprayer systemExpiredDec 11, 92Nov 23, 93[C02F]
5256281 Baffle system for anaerobic sewage treatment pondExpiredJun 20, 91Oct 26, 93[C02F]
5235797 Method of harvesting aquatic plantsExpiredFeb 13, 92Aug 17, 93[A01D]
5197263 Method and apparatus for harvesting aquatic plantsExpiredSep 13, 91Mar 30, 93[A01D]
5180501 Floating aquatic plant water treatment systemExpiredJun 20, 91Jan 19, 93[C02F]
5161354 Aquatic plant harvesterExpiredMay 10, 91Nov 10, 92[A01D]
5096577 Floating aquatic plant water treatment systemExpiredMar 17, 89Mar 17, 92[C02F]
4536988 Aquatic biomass containment barrier and method of assembling sameExpiredJan 31, 84Aug 27, 85[A01G]

Top Inventors for This Owner

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