HENRY PRATT COMPANY

Patent Owner

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Patent Activity in the Last 10 Years

Technologies

Intl Class Technology Matters Rank in Class
 
  
 
F16K VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING271

Top Patents (by citation)

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Recent Publications

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Recent Patents

Patent # Title Filing Date Issue Date Intl Class
6543747 Valve actuator apparatusNov 29, 00Apr 08, 03[F16K]
5097857 Electro-hydraulic valve-actuator systemAug 02, 91Mar 24, 92[F16K]

Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
6354327 Automatic position-control valve assemblyExpiredJul 31, 00Mar 12, 02[F15B]
5069240 Flexible seating structure for rotary valvesExpiredDec 12, 90Dec 03, 91[F16K]
4863144 Plug valveExpiredOct 19, 88Sep 05, 89[F16K]
4825906 Angle pattern control valveExpiredJun 06, 88May 02, 89[F16K]
4739794 Rotatable valve with anti-cavitation structureExpiredAug 29, 86Apr 26, 88[F17D]
4708160 Post assembly for buried valve having an above ground actuatorExpiredAug 25, 86Nov 24, 87[F16L]
4702275 Post assembly for a buried valveExpiredMay 12, 86Oct 27, 87[F16K]
4653531 Support for underground valve indicatorExpiredAug 04, 86Mar 31, 87[F16K, F16M]
4498798 Locating pinExpiredSep 26, 83Feb 12, 85[F16B]
4497340 Seal for post indicator valve assemblyExpiredJan 24, 83Feb 05, 85[F16K]
4491300 Valve with improved sealing structureExpiredNov 27, 81Jan 01, 85[F16K]
4448148 Post indicating valve assembly indicatorExpiredMay 03, 82May 15, 84[F16K]
4428242 Flowmeter using twisting torqueExpiredMar 11, 82Jan 31, 84[G01F]
4411288 Valve position indicator with variable indicator platesExpiredJul 27, 81Oct 25, 83[F16K]

Top Inventors for This Owner

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