Did You Know...
...that to encourage use of his new invention, the shopping cart, market owner Sylvan Goldman hired fake shoppers to push the carts around his store in Oklahoma City? Seems his customers were reluctant to give up their hand-carried baskets.
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| Number | Title | Issue Date |
| 7037151 | Oar Disclosed is an oar, which has a supplementary blade pivotally connected to one end of the blade adjacent to the shaft thereof to increase the area of the water expelling surface, enhancing the rowing efficiency. ... | 05/02/2006 |
| 6273680 | Extraction of energy from flowing fluids Method and apparatus for converting the kinetic energy of a moving fluid stream into useful work by using a cascade of thin aero or hydro foils positioned therein. The foils may be provided with at least two degrees of freedom and adjacent foils move out ... | 08/14/2001 |
| 5717264 | Concentric-double-shaft simultaneously rotating apparatus A concentric-double-shaft simultaneously rotating apparatus in which a part of the force for driving an inner shaft to rotate is obtained by a device other than a rotation controlled motor to thereby reduce the capacity of the rotation controlled motor to... | 02/10/1998 |
| 5466124 | Device for generating an inversion-kinematic movement A device for converting a rotational movement for directing displacement of a flowable medium is provided with a mount and two rotatably mounted fixed axles which are arranged at a distance from one another on the mount and on which are articulated two en... | 11/14/1995 |
| 4061102 | Roll stabilizer for boats A stabilizer device for minimizing the roll of a boat including two plates connected by a hinge and a plurality of bridles attached to the plates so that when the stabilizer is pulled up through the water by the bridles the plates open about the hinge to ... | 12/06/1977 |
| 3995972 | Wind machine with reciprocating blade means An apparatus is provided for converting an air flow into useful mechanical work by means of a reciprocating blade means. The preferred blade means comprises a plurality of lightweight, airfoil shaped blades mounted in a stack for moving a carrier associat... | 12/07/1976 |
