Did You Know...
...that the Eveready Battery began as an invention called the "electric flowerpot," which was a tube with a battery and light bulb inside? The idea was to fasten this gizmo to the side of a flowerpot so it would illuminate the flowers from the bottom. The idea died on the vine and the businessman who licensed the flower pot, Conrad Huber, was left with a pile of useless tubes -- until he found a way to market them as batteries to light the world!
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| Number | Title | Issue Date |
| 7367679 | Light source for a display device A light source for a display device. The light source comprises a light-producing element, a reflector disposed around at least a portion of the light-producing element, a housing disposed substantially around the reflector, an airflow channel defined adjacent an ou... | 05/06/2008 |
| 6947200 | Double substrate reflective spatial light modulator with self-limiting micro-mechanical elements A spatial light modulator includes an upper optically transmissive substrate held above a lower substrate containing addressing circuitry. One or more electrostatically deflectable elements are suspended by hinges from the upper substrate. In operation, individual m... | 09/20/2005 |
| 6402326 | Fixed image projecting apparatus A fixed image projection system that can project an image for a short or long period of time without damage to the film. The system is comprised of a light source having a halogen lamp and a cold coated reflector detachably mounted on a housing having fil... | 06/11/2002 |
| 6227672 | Fixed image projecting apparatus A fixed image projection system that can project an image for a short or long period of time without damage to the film. The system is comprised of a light source having a halogen lamp and a cold coated reflector detachably mounted on a housing having fil... | 05/08/2001 |
| 5951137 | Fixed image projecting apparatus A fixed image projection system that can project an image for a short or long period of time without damage to the film. The system is comprised of a light source having a halogen lamp and a cold coated reflector detachably mounted on a housing having fil... | 09/14/1999 |
| 5331360 | Adaptor for overhead projector Apparatus for converting an overhead projector to use photographic slides includes a fresnel disk that shortens the illumination convergence point to match the focal length of a typical slide projector. The apparatus includes a base that covers the platen... | 07/19/1994 |
| 4979814 | Viewing of developed roll of slide film Apparatus is described for the detailed viewing of a strip of 35 mm slide film which is enclosed in a transparent jacket. The apparatus includes a projector with a film gate which is wide enough to pass the jacket, and which projects sufficient area to in... | 12/25/1990 |
| 4961641 | Slide projector with ergonomic slide selection and access A slide projector has a light table oriented at 60° to a generally horizontal base and connected thereto by a detachable connector. The light table has a tray mounted thereon for movement into mutually orthogonal directions parallel to the plane of the l... | 10/09/1990 |
| 4728184 | Foldable transparency enlarger for overhead projector A device for supporting a transparency on a top surface of an overhead projector is foldable from a compact unit into a structure having a planar base with an indentation for receiving a transparency and legs which are pivotally mounted on the base and re... | 03/01/1988 |
| 4353627 | Over-head projector with partial projection device An over head projector has a standard projection lens for projecting the whole view of an original image and a partial projection lens for projecting a part of the original image in enlarged scale. One of the projection lenses is selectively brought to a ... | 10/12/1982 |
| 4244641 | Microfilm reader A microfilm reader for enlarged projections of any desired micropicture among a number of such pictures on a microfilm. The microfilm is interleaved between two movable plates. A slidable support for the image forming objective is pressed with a tensioned... | 01/13/1981 |
| 4221473 | Image expander for rear-screen projectors A slide projector located within a rear-screen projector has means therein for projecting images, contained on slides, onto a self-contained projection screen. Two lenses having different focal lengths are mounted within the projector housing and may alte... | 09/09/1980 |
| 4123699 | Vertically scanning microfilm reader and reader printer The inventive microfilm reader and reader-printer has a film gate which is anchored to the chassis of the reader or reader-printer and which is entirely separate from a light system, lens mount, and focusing system which float up and down with respect to ... | 10/31/1978 |
| 4094599 | Flexible magazine slide projector with movable lens A slide projector for use with magazines of the flexible type in which slides are supported for movement around a closed-loop path and are swingable one by one into and out of a slide-projection station about an axis defined by a rotary drive shaft. The m... | 06/13/1978 |
| 4050799 | Microform reader The disclosure relates to a microform reader apparatus of the type which projects a magnified image of an image film frame onto the rear side of a viewing screen to facilitate forward viewing of the magnified image. The microform reader of the present inv... | 09/27/1977 |
