Patent Leaderboard
USPTO Patent Rankings Data through Dec 31, 2025
Home › Excess pressure valve particularly for a fluid pressure operated telescopic supporting element employed in underground mining

Excess pressure valve particularly for a fluid pressure operated telescopic supporting element employed in underground mining

US Patent 4274435 · Granted Jun 23, 1981

Assignee

Inventors

View full patent text on Google Patents →

More Patents by These Inventors

Shaking control unit for a hydraulic cylinder1991
Shaking control unit for a hydraulic cylinder1990
Method of separating the upper coal in seams1989
Electrohydraulic three-port, two position valve1985
Control device for an advancing support in underground mining1983
Unlockable check valve, particularly for use as recovery and setting valve in un1982