GRAVER COMPANY, THE

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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
 
  
 
C08G MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS 1119
 
  
 
C08J WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER- TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C C08F, C08G or C08H 177

Top Patents (by citation)

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Recent Publications

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Recent Patents

Patent # Title Filing Date Issue Date Intl Class
5643968 Process for producing ion exchange membranes, and the ion exchange membranes produced therebyNov 23, 94Jul 01, 97[C08J, C08G]
5376278 Filter and a method for separating charged particles from a liquid streamJul 01, 93Dec 27, 94[C02F]
5346624 Method and apparatus for treatment of aqueous solutionsJan 11, 93Sep 13, 94[B01O, C02F]

Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
5601704 Automatic feedback control system for a water treatment apparatusExpiredApr 11, 94Feb 11, 97[C02F]
5403492 Ion exchange resin having dual morphologyExpiredSep 01, 93Apr 04, 95[C02F]
5397477 Ion exchange resin having dual morphologyExpiredJan 11, 93Mar 14, 95[C02F]
5281317 Electrodialytic water splitting process for removing SO.sub.2 from gasesExpiredOct 15, 92Jan 25, 94[B01D]
5250159 Bipolar membrane stack and method for producing acid and monovalent base from impure saltExpiredJun 12, 91Oct 05, 93[B01D]
5212205 Regeneration of deep bed condensate polishersExpiredFeb 04, 92May 18, 93[B01J]
5207879 Bipolar membrane stack and method for production of low chloride sodium hydroxideExpiredMar 11, 91May 04, 93[B01D]
5207905 Baffle assembly for air and water backwash of a media filterExpiredSep 25, 92May 04, 93[B01D]
5196122 External regeneration system for mixed bed ion exchangersExpiredAug 10, 92Mar 23, 93[B01D]
5192446 Cation exchange resins having an enhanced capacity for iron oxidesExpiredJan 24, 92Mar 09, 93[C02F]
5126052 Condensate polishing system incorporating a membrane filterExpiredFeb 07, 91Jun 30, 92[B01D]
5114596 Backwash method and apparatusExpiredOct 16, 90May 19, 92[B01D]
5049233 Recovery of sodium hydroxide and aluminum hydroxide from etching wasteExpiredJul 06, 90Sep 17, 91[C03C, C23F, B44C]
5028322 Low profile underdrain strainer assembly with improved distribution/fastening meansExpiredJul 11, 89Jul 02, 91[B01D]
5022997 Method for treating aqueous solutionsExpiredDec 18, 89Jun 11, 91[C02F, B01D]
4889624 Lamella gravity separatorExpiredJan 06, 89Dec 26, 89[B01D]
4880513 Method and apparatus for generating acid and base regenerants and the use thereof to regenerate ion-exchange resinsExpiredJun 20, 86Nov 14, 89[B61D, C02F]
4863498 Deaerator unitExpiredDec 02, 88Sep 05, 89[B01D]
4747955 Purification of liquids with treated polyester fibersExpiredApr 13, 87May 31, 88[B01D]
4707257 Air/water distributor underdrainExpiredMay 29, 86Nov 17, 87[B01D]

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