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 |
| 5391057 | Compressing gas flowing through a conduit An apparatus (1) is provided for compressing gas, the apparatus comprising a conduit (3) provided with a non-return inlet valve (10) arranged at the upstream inlet (5) end of the conduit (3), a localized ignition source (20) arranged in the conduit (3) do... | 02/21/1995 |
| 4644746 | Gas compressor for jet engine A gas compressor is provided having a source of supersonic velocity gases acting to accelerate inlet gases through a mixing region and diffuser. The inlet gas is introduced into the mixing chamber through a converging-diverging nozzle, causing said gas to... | 02/24/1987 |
| 4515500 | Combustion powered wave generator A wave generator for a swimming pool, comprising a caisson divided into a plurality of wave-generating chambers. Each wave-generating chamber communicates with the swimming pool through a below-the-water passage and has a sealed portion which extends abov... | 05/07/1985 |
| 4398362 | Oceanic seaplow system An oceanic seaplow system comprising a plurality of vessels forming a mini fleet wherein a flexible hose is joined at one end to a suction turbine associated with a mothership and the other end is connected to a suction stud on a seaplow travelling on the... | 08/16/1983 |
| 4209983 | Internal electric explosion engine An internal explosion engine, having a vessel with an interior space and inlets and outlets for respectively introducing fluid into said space at relatively low pressure and removing said fluid from said space at relatively high pressure; an electric disc... | 07/01/1980 |
