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 |
| 4098331 | Solar heat exchange panel and method of fabrication A panel having multiple tubular passages extending therethrough and fitted on each end with a fluid tight hollow header. Apertures through one side of the headers place the tubular passages in communication with the interior of the headers. Fluid pumped i... | 07/04/1978 |
| 3982723 | Pinch valve and method for fabrication A valve body having a circular cylindrical shape may be made of plastic or any other suitable material. A radial hole through the wall of the body has a pressure inlet fitting positioned therein. A flexible tubing is passed through the body co-axial there... | 09/28/1976 |
| 3934323 | Solar heat exchange panel and method of fabrication A panel having multiple tubular passages extending therethrough and fitted on each end with a fluid tight hollow header. Apertures through one side of the headers place the tubular passages in communication with the interior of the headers. Fluid pumped i... | 01/27/1976 |
