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Class Information
Number: 185/33
Name: Motors: spring, weight, or animal powered > Weight > With weight raising means, (e.g., winding) > With motor
Description: Weight motors in which the weights are raised by motor means.

Patents under this class:

Patent Number Title Of Patent Date Issued
7765804 Hydraulic motor using buoyant and gravitational forces to generate kinetic energy Aug. 3, 2010
7644805 Power generation system Jan. 12, 2010
7406887 Pumping unit with variable work stroke and return stroke torque factor characteristics Aug. 5, 2008
6422347 Power-loop apparatus and method Jul. 23, 2002
6386322 Method and apparatus for oil well pumping May. 14, 2002
5992252 Constant force side button engagement mechanism Nov. 30, 1999
5890240 Sheet roll up Apr. 6, 1999
5533214 Sheet roll up Jul. 9, 1996
5146798 Wedge-hinge transmission apparatus and method Sep. 15, 1992
4848134 Vehicle acceleration apparatus Jul. 18, 1989
4587084 Control rod drive May. 6, 1986
4492287 Apparatus for utilizing the impact force of bodies falling under gravity Jan. 8, 1985
4333548 Weight driven rotary power generating apparatus Jun. 8, 1982
4302903 Stepping device Dec. 1, 1981
4201059 Hybrid energy convertor May. 6, 1980

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