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  • [发明专利]USD3765799 _ LEDNER A,US 1972年05月01日
    A large volume pumping method and apparatus comprising an economical thermal-gravity pumping system which is non-polluting, and employs relatively free and limitless, generally available, sources of energy input. The invention is particularly useful i...
  • [发明专利]USD3764231 _ HITACHI LTD,JA 1972年07月03日
    A Francis runner and a method for manufacture the same are provided in which the openings or notches are formed in the shroud ring in each water passage between the adjacent blades and in spaced apart relation therewith in order to facilitate the fini...
  • [发明专利]USD3769944 _ REDSKIN ENG CO,US 1972年05月08日
    A rotary engine for use as a fluid pump or motor, gas compressor or vacuum pump, or internal combustion engine with improved performance and reduced exhaust emissions as compared to conventional engines. The rotary engine provides a cycle of alternate...
  • [发明专利]US19720319733 _ SIEMENS AG,DT 1972年12月29日
    The gain factor of the transfer function between the angle of the rotor blades and the efficiency of a water turbine is identified, and by means of an extreme value regulator and adjustment of the rotor blade angle, the gain factor is adjusted to zero...
  • [发明专利]US19720285783 _ TEXACO DEV CORP,US 1972年09月01日
    A method of heating a fluid which can be, for example, molten sodium, in a dry geothermal reservoir formation penetrated by an injection well and a production well comprising injecting the said fluid into the formation via the injection well, forcing ...
  • [发明专利]USD3794445 _ HITACHI LTD,JA 1972年04月28日
    A water turbine runner comprising a plurality of blades coaxially fixed to one axis each of said blades is composed of an iron-based material, wherein each blade is provided with a smooth surface weld metal on the surface where erosion due to cavitati...
  • [发明专利]USD3772966 _ MILLS C,US 1972年06月28日
    A fluid power operator for generating a rotary output torque. A pair of fixed, linear piston rods is located in a parallel spaced disposition to extend between and through a pair of housing end walls. Two fixed pistons are individually fixed to a midp...
  • [发明专利]USD3773995 _ WEC PITTSBURGH,US 1972年10月27日
    A circuit breaker operating mechanism characterized by a crank shaft, a closing spring connected to the crank shaft, motor-operating structure for driving the crank shaft to charge the closing spring, a ratchet wheel mounted on the crank shaft, a reci...
  • [发明专利]US19720311011 _ ROCKWELL INT CORP,US 1972年11月30日
    Apparatus and methods of operation are disclosed for combining high-energy primary flow fluid (normally a gaseous medium obtained from an aircraft system primary power plant or engine) and induced secondary flow fluid (ambient air) in the essentially ...
  • [发明专利]US19720256561 _ TOMPKINS L,US 1972年05月24日
    A sliding vane rotary fluid motor including a rotor cylinder shiftable laterally of the axis of rotation of the rotor between a first position generally concentric with the rotor axis and a second position eccentrically disposed relative to the rotor ...
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