Did You Know...
...that the x-ray was discovered purely by accident? When German physicist Wilhelm Konrad von Roentgen was experimenting with cathode rays in 1895, he put an activated Crookes tube in a book and went out to lunch. When he returned, he discovered that a key that had also been placed in the book showed up as an image on the developed film!
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| Number | Title | Issue Date |
| 4663056 | Vacuum-sewage-collection system Holding tanks in an extremely simple vacuum-sewage system can provide high volume storage against emergencies such as vacuum pump failure, while providing under normal circumstances frequent, sudden, small-volume discharges in which any one holding tank d... | 05/05/1987 |
| 4197200 | Shipboard blackwater physical/chemical treatment system An automatic dual-mode shipboard wastewater treatment system employing ozone for disinfection of the primary effluent. Solids are removed and pumped, for example, to the ship's boiler or other equipment for incineration, while the liquid waste is pumped t... | 04/08/1980 |
| 4193868 | Ion exchange method and apparatus An ion exchange apparatus having a plurality of channels or manifolds used for liquid distribution and collection purposes within an end of a container adjacent to an ion exchange resin bed can be improved by using a check valve permitting flow in one dir... | 03/18/1980 |
| 4176063 | Water purifier system and valve An economical and commercially practical reverse-osmosis water purifier system which has no back pressure acting against the semipermeable membrane, so that the filtering rate is maximized. Furthermore, the supply of tap water to the system is shut off au... | 11/27/1979 |
