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SHAFER VALVE CO

Overview
  • Total Patents
    120
About

SHAFER VALVE CO has a total of 120 patent applications. Its first patent ever was published in 1946. It filed its patents most often in United States, Canada and France. Its main competitors in its focus markets mechanical elements, measurement and machines are ASCO JOUCOMATIC, SUN HYDRAULICS LLC and KANEKO SANGYO CO LTD.

Patent filings in countries

World map showing SHAFER VALVE COs patent filings in countries
# Country Total Patents
#1 United States 37
#2 Canada 27
#3 France 16
#4 United Kingdom 13
#5 Germany 10
#6 Australia 4
#7 Japan 4
#8 Italy 2
#9 Netherlands 2
#10 Austria 1
#11 Brazil 1
#12 Mexico 1
#13 Norway 1
#14 Sweden 1

Patent filings per year

Chart showing SHAFER VALVE COs patent filings per year from 1900 to 2020

Top inventors

# Name Total Patents
#1 Shafer Homer J 38
#2 Shafer Homer John 7
#3 Johnson George T 5
#4 Metzger Benjamin A 5
#5 Griffin Steven M 4
#6 Covington Morris T 4
#7 Leblanc William K 3
#8 Griffin S M 3
#9 Covington M T 3
#10 Shafer Jon L 3

Latest patents

Publication Filing date Title
US5361622A Device and method for detection of leaks in pressurized fluid vessels
US5244004A Hydraulic pipeline valve operating system
US4633702A Torque and friction tester
US4144743A Electronic fluid pipeline leak detector and method
US4102128A Hand pump system for hydraulic motor
US4091658A Electronic fluid pipeline leak detector and method
US4005642A Cross-over port construction for hydraulic motors
US4012944A Electronic fluid pipeline leak detector and method
US3911678A Safety shut-off for pump
US3824901A Spring return for piston operator
US3360930A Electro-hydraulic valve operator
US3171332A Adjustable stop for rotary vane motors
US3170296A Manual and motor drive apparatus for hydraulic motor
GB989957A Fluid motor control
US3159378A Sealing construction for piston valve
US3055345A Hydraulic latch system for fluid motor operator
US3083945A Removable sealing construction for valves
GB894980A Rotary fluid motor
US2934045A Multiple seal for rotary fluid motor
US3089430A Safety shut-off for piston pump and valve unit