Did You Know...
...that Kleenex tissue was originally designed to be a gas mask filter? It was developed at the beginning of World War I to replace cotton, which was then in short supply as a surgical dressing.
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| Number | Title | Issue Date |
| 4807040 | Signal processing filter for an image projection device utilizing an oil film A projection type image display device utilizing an oil film is disclosed, which device comprises a filter having frequency characteristics enabling reduction of the spatial frequency response in the vertical direction for an input signal having a stepwis... | 02/21/1989 |
| 3946154 | Reduced initial delay in projecting high quality images from a fluid light valve Elapsed time from turn-on of a fluid light valve to the time when the initial, turbulent fluid has settled to a quiescent condition on which a noise free image may be inscribed by an electron beam is reduced by expanding vertical sweep size of the raster,... | 03/23/1976 |
