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 |
| 6679121 | Blade vibration test apparatus and method An apparatus and method for testing vibration in a bladed disk includes a motor-driven rotor upon which the bladed disk can be attached. At least one nozzle coupled with a liquid source is positioned to direct liquid from the liquid source to a position w... | 01/20/2004 |
| 5251491 | Method of and apparatus for measuring a tension of grid element A method of and apparatus for measuring a tension by the steps of vibrating a measured object of a line- or belt-shaped configuration by the flow of air from an air nozzle so that the measured object is resonated, counting the number of vibrations of the ... | 10/12/1993 |
| 4809553 | Flutter exciter A flutter exciter induces vibration either for actual aircraft flight testing or for wind tunnel model testing. The basic flutter exciter unit is a pair of rotatable concentric cylinders mounted on either a fixed vane or an aircraft wing or a tail surface... | 03/07/1989 |
| 4776216 | Programmable jet blade excitation system System and method for characterizing the resonant responses of a plurality of rotating blades in a turbo machine. The system comprises a plurality of controllable fluid jets disposed about a blade row for exciting rotating blades with selectable frequenci... | 10/11/1988 |
| 4350043 | Airfoil vibration test apparatus An apparatus for inducing high frequency out-of-phase, vibrations in adjacent span-wise panel portions of a plate type structure, such as an airfoil blade of a gas turbine engine. The apparatus includes a novel bifurcated duct for conducting and directing... | 09/21/1982 |
| 4334592 | Sea water hydraulic fluid system for an underground vibrator A hydraulic drive system for an underwater vibrator has a hydraulically driven mass for generating a seismic wave into the seabed. The hydraulic drive system for the vibrator is accomplished by filtering sea water, conveying the filtered sea water to the ... | 06/15/1982 |
