Wallace & Tiernan

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Patent Activity in the Last 10 Years

Technologies

Intl Class Technology Matters Rank in Class
 
  
 
F04B POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS 161

Top Patents (by citation)

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Recent Publications

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Recent Patents

Patent # Title Filing Date Issue Date Intl Class
5957669 Diaphragm pump including improved drive mechanism and pump headJun 14, 96Sep 28, 99[F04B]

Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
4822474 Residual analyzer assemblyExpiredApr 30, 87Apr 18, 89[G01N]
4806082 Fluid actuated pump with improved flow-limiting fluid refill valveExpiredNov 09, 87Feb 21, 89[F04B]
4759386 Electromechanical linear actuatorExpiredJan 20, 87Jul 26, 88[F16K]
4755267 Methods and apparatus for protecting metal structuresExpiredJun 03, 86Jul 05, 88[C23F]
4633362 Solenoid driven metering pump supply voltage compensation circuitExpiredDec 09, 85Dec 30, 86[H01H]
4531673 Spray jet polymer powder wetterExpiredAug 13, 82Jul 30, 85[B05B]
4497749 Check valve for ammonia injector apparatusExpiredDec 01, 83Feb 05, 85[F16K, C02F]
4474540 Tubular diaphragm pumpExpiredSep 10, 82Oct 02, 84[F04B]
4457821 Cathodic protection apparatus for well coated metal vessels having a gross bare areaExpiredJan 17, 83Jul 03, 84[C23F]
4426156 Polyelectrolyte wetting apparatusExpiredAug 13, 82Jan 17, 84[B01F]
4267029 Anode for high resistivity cathodic protection systemsExpiredJan 07, 80May 12, 81[C23F]
4248690 Apparatus for production of sodium hypochloriteExpiredJan 28, 80Feb 03, 81[C25B]
4235688 Salt bridge reference electrodeExpiredJun 27, 78Nov 25, 80[G01N]

Top Inventors for This Owner

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