David Brown Hydraulics Limited

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Patent Activity in the Last 10 Years

Technologies

Intl Class Technology Matters Rank in Class
 
  
 
F01C ROTARY-PISTON OR OSCILLATING-PISTON MACHINES OR ENGINES 128
 
  
 
F16L PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL169

Top Patents (by citation)

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Recent Publications

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Recent Patents

Patent # Title Filing Date Issue Date Intl Class
5997268 Positive displacement hydraulic machine having a recess receiving a spigot for sealingDec 05, 97Dec 07, 99[F16L, F01C]

Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
2012/0070,312 CONTROLLED HYDRAULIC SYSTEMSAbandonedMay 13, 10Mar 22, 12[F04B]
4819430 Variably charged hydraulic circuitExpiredJan 21, 83Apr 11, 89[F16D]
4739967 Mechanical detentExpiredMay 21, 86Apr 26, 88[F16K]
4664017 Hydraulic control system and valveExpiredMar 19, 84May 12, 87[F15B]
4642019 Hydraulic control system and valve thereforExpiredDec 19, 84Feb 10, 87[B65F]
4408453 Hydraulic control systemExpiredJan 16, 81Oct 11, 83[F16H]
4404534 Electromagnetic assemblyExpiredOct 14, 80Sep 13, 83[H01F]
4364621 Electrical connectorExpiredFeb 28, 80Dec 21, 82[H01R]
4355660 Pneumatically controlled, four position hydraulic valveExpiredApr 15, 80Oct 26, 82[F16K]
4311006 Pressure compensated steering systemExpiredOct 29, 79Jan 19, 82[F15B]
4300591 Anti-cavitation and overload relief valve for a hydraulic systemExpiredJan 31, 80Nov 17, 81[F16K]
4215720 Fluid control valve systemExpiredOct 02, 78Aug 05, 80[F15B]
4210170 Anti-cavitation and overload relief valve for a hydraulic systemExpiredFeb 17, 78Jul 01, 80[F16K]
4209031 Positive control valve assemblyExpiredFeb 01, 78Jun 24, 80[F15B]
4197705 Hydraulic control systemExpiredMay 30, 78Apr 15, 80[F16H]

Top Inventors for This Owner

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