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HYDRAULIC UNIT SPECIALITIES CO

Overview
  • Total Patents
    121
About

HYDRAULIC UNIT SPECIALITIES CO has a total of 121 patent applications. Its first patent ever was published in 1952. It filed its patents most often in United States, Canada and United Kingdom. Its main competitors in its focus markets mechanical elements, machines and civil engineering are MEAD FLUID DYNAMICS INC, BECKETT HARCUM CO and ROSS OPERATING VALVE CO.

Patent filings in countries

World map showing HYDRAULIC UNIT SPECIALITIES COs patent filings in countries
# Country Total Patents
#1 United States 28
#2 Canada 24
#3 United Kingdom 21
#4 Germany 19
#5 Spain 12
#6 France 12
#7 Sweden 4
#8 Australia 1

Patent filings per year

Chart showing HYDRAULIC UNIT SPECIALITIES COs patent filings per year from 1900 to 2020

Top inventors

# Name Total Patents
#1 Tennis Francis H 50
#2 Tennis Francis Henry 14
#3 Henry Tennis Francis 6
#4 Schneider Dana J 4
#5 Vilter Thomas R 4
#6 Tennis F 4
#7 Tolbert William N 3
#8 Bethke Donald G 3
#9 H Tennis Francis 1
#10 Alfred Lauck John 1

Latest patents

Publication Filing date Title
AU6269373A Pilot controllable valve mechanism
DE1650408A1 Control slide for double-acting hydraulic piston motors
GB1141416A Speed and directional control valve for double acting lift cylinder
US3402828A Boat lifting and mooring device
DE1550282B1 HYDRAULIC CONTROL VALVE
GB1098010A Pilot governed control valve mechanism
US3263574A Speed and directional control valve for double acting lift cylinder
GB1078618A Locking means for hydraulic control valves
US3247768A Interlock for hydraulic control valves and the like
US3357451A Speed and directional control valve for double-acting lift cylinder
US3260377A Lifting device
ES303171A3 Immobilization system of control hydraulic valves and similar appliances (Machine-translation by Google Translate, not legally binding)
ES303026A3 Hydraulic regulation valve system with vacuum regulator device. (Machine-translation by Google Translate, not legally binding)
ES302243A3 Improvements in the levers for control hydraulic valve. (Machine-translation by Google Translate, not legally binding)
ES302242A3 Regulation instruments for hydraulic equipment with ratchet mechanism. (Machine-translation by Google Translate, not legally binding)
ES301861A1 System of valve regulator of speed and direction for cylinder elevator of double action (Machine-translation by Google Translate, not legally binding)
ES301476A1 Valve regulation mechanism of pilot-operated pressure fluids. (Machine-translation by Google Translate, not legally binding)
ES301431A1 Improvements in hydraulic drive valves with vacuum regulation device. (Machine-translation by Google Translate, not legally binding)
DE1240354B Control slide for double-acting hydraulic piston motors
GB1033718A Control valve for double acting lift cylinder