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Actor Zeppo Marx patented a "Cardiac Pulse Rate Monitor" in 1969.
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| Number | Title | Issue Date |
| 4051463 | Method and apparatus for inverting the polarity of an input image formed on a surface of an image recording device Method and apparatus for inverting the polarity of an input image formed on a surface of an image recording device which deforms when illuminated in the presence of an electrostatic field applied thereacross. The image recording device, comprising a layer... | 09/27/1977 |
| 4051462 | Computer memory A memory system is shown in which communication to and from memory cells is effected by optical beams. Memory cells are shown employing elements with negative resistance and operating in either of two stable modes. Other memory cells are shown employing s... | 09/27/1977 |
| 4041475 | Computer memory A memory system is shown in which communication to and from memory cells is effected by optical beams. Memory cells are shown employing elements with negative resistance and operating in either of two stable modes. Other memory cells are shown employing s... | 08/09/1977 |
| 4023969 | Deformable elastomer imaging member employing an internal opaque deformable metallic layer An imaging system comprising an imaging member including a deformable metallic layer arranged between a pair of deformable layers, at least one of which comprises an elastomer material. In operation an electrical field is established across the deformable... | 05/17/1977 |
| 3998523 | Electro-optic ceramic material An electro-optic ceramic material useful for electro-optic applications comprising an anti-ferroelectric phase (or para-electric phase) and a ferroelectric phase, the two phases of which coexist having a morphotrophic phase boundary. The scattering of lig... | 12/21/1976 |
| 3945715 | Electro-optical birefringence device employing edge effect An electro-optical transducer and data storage device is operated by electrically establishing different electric field levels in a retentive ferroelectric PLZT crystal. The crystal may have a plurality of areas that serve as data storage elements, each o... | 03/23/1976 |
| 3932025 | Imaging system There is disclosed an imaging system for forming a plurality of images on the same surface. The imaging system includes an electro-optic imaging member comprising a voltage or current-sensitive light modulating layer, a layer of photoconductive material w... | 01/13/1976 |
