KEYSTONE INTERNATIONAL HOLDINGS CORP.

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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 AERATING865
 
  
 
F16L PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL169
 
  
 
G01F MEASURING VOLUME, VOLUME FLOW, MASS FLOW, OR LIQUID LEVEL; METERING BY VOLUME 158
 
  
 
G05D SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES 183

Top Patents (by citation)

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Recent Publications

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Recent Patents

Patent # Title Filing Date Issue Date Intl Class
5769113 Dual pilot manifold assembly for a safety relief valveNov 06, 96Jun 23, 98[F16K]
5590684 Dual pilot manifold assembly for a safety relief valveSep 01, 95Jan 07, 97[F16K]
5518028 Adjustable magnet carrier for a valve position indicatorOct 07, 94May 21, 96[F16K]
5333635 Fluid pressure relief system for pressure vesselsJun 07, 93Aug 02, 94[F16K]
RE34610 Mounting means for fluid pressure transmittersJun 23, 92May 17, 94[G01F]
5292155 Method and apparatus for mounting an instrument assembly on a main flow lineApr 06, 92Mar 08, 94[F16L]
5282491 Fluid pressure relief system for pressure vesselsJan 11, 93Feb 01, 94[F16K]
5249593 Fluid pressure relief system for pressure vesselsJan 11, 93Oct 05, 93[F16K]
5246034 Fluid pressure relief system for pressure vesselsJan 11, 93Sep 21, 93[F16K, F24K]
5139229 Ball valve and method of assemblyNov 18, 91Aug 18, 92[F16K]

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
5439619 Steam conditioning butterfly valveExpiredDec 09, 93Aug 08, 95[B01F]
5400819 Measuring and regulating valveExpiredMar 05, 93Mar 28, 95[F16K]
5385121 Steam desuperheaterExpiredJan 19, 93Jan 31, 95[F04F, G21C]
5294091 Stop cock for a liquid containerExpiredApr 01, 92Mar 15, 94[F16K]
5269347 Fluid pressure isolator apparatusExpiredDec 22, 92Dec 14, 93[F16K]
5244183 Fugitive emission sealing assemblyExpiredOct 04, 91Sep 14, 93[F16K, G01M]
5172716 Recirculation valveExpiredJul 01, 91Dec 22, 92[G05D]
5125624 Apparatus for a disc-stem connectionExpiredJan 08, 91Jun 30, 92[F16K]
5097635 Method and apparatus for automatic ball to seat lappingExpiredAug 06, 90Mar 24, 92[B24B]
5090658 Bellows sealed rotary valve and seal assemblyExpiredJan 30, 91Feb 25, 92[F16K]
5064169 Shock absorbing means for flow control devicesExpiredJan 22, 91Nov 12, 91[F16K]
5054374 Rotary actuatorExpiredDec 07, 90Oct 08, 91[F01C]
5044257 Rotary actuator and method for forming a rotary pistonExpiredMar 20, 90Sep 03, 91[B28B, F01B, F01C]
5036884 Mounting means for fluid pressure transmittersExpiredNov 19, 90Aug 06, 91[G01F]
5027852 Pilot valve for control valves and method of operationExpiredJun 04, 90Jul 02, 91[G05D]
5011116 Shock absorbing sealing means for flow control devicesExpiredMar 30, 90Apr 30, 91[F16K]
5007330 Rotary actuator and seal assembly for use thereinExpiredDec 18, 89Apr 16, 91[F01C]
5000851 Turbine filter with pressure seal bonnetExpiredMar 01, 90Mar 19, 91[B01D]
4967779 Method of installing a valve seat in a valve bodyExpiredApr 09, 90Nov 06, 90[F16K]
4967783 Recirculation valve with pilot valveExpiredFeb 22, 90Nov 06, 90[G05D]

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