Did You Know...
...that one person who claimed to be the inventor of the television is Russian emigre Vladimir Zworykin? In 1929 David Sarnoff, founder of RCA, asked Zworykin what it would take to develop TV for commercial use. He said: a year and a half and $100,000. In reality, it took 20 years and $50 million! Before his death in 1982 at the age of 92, Zworykin said of his invention: "The technique is wonderful. It is beyond my expectations. But the programs! I would never let my children even come close to this thing."
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| Number | Title | Issue Date |
| 7261760 | Member having separation structure and method for manufacture thereof A member having a separated structure made by an alloy consisting of two regions having different compositions with each other is formed by casting a molten alloy into a prescribed shape, or by spray-quenching the same from a temperature of Tc+10° C. or more, where... | 08/28/2007 |
| 4387276 | Carbon transducer with electrical contact A carbon transmitter utilizes an electrode prepared by in situ reaction between substrate copper and introduced sulfur. Good surface adhesion between the resulting CuS layer and the substrate is assured by use of a two-phase cobalt/copper substrate.... | 06/07/1983 |
| 4288663 | Noise canceling transmitter This transmitter is designed for installation in a telephone handset to replace a standard carbon transmitter, for the purpose of excluding the ambient noise from the telephone lines, so that only the voice of the speaker is transmitted. This transmitter ... | 09/08/1981 |
| 4251696 | Compact telescoping telephone set There is disclosed a compact telephone instrument with a telescoping operation. A first housing has a conventional telephone receiver located within a hollow recess thereof. The housing is removably secured to a bottom housing which contains a dialer asse... | 02/17/1981 |
| 4249043 | Electret transducer backplate, electret transducer and method of making an electret transducer An electret transducer backplate is made of a thermo-softening plastics material rendered electrically conducting by electrically conducting particles distributed therethrough. An electret foil diaphragm is mounted on the backplate and the relative flexur... | 02/03/1981 |
| 4205206 | Carbon granule microphone with molded resin-conductive carbon electrode Disclosed is an electrode for a carbon transmitter which comprises a body of an electrically conductive material, such as metal or a conductive resin, with at least a part of the surface of the body comprising electrically conductive carbon. Such an elect... | 05/27/1980 |
| 4142074 | Microphone 1. A sound actuated device comprising a non-metallic cylindrical case having a closed end provided with a coaxial aperture extending therethrough, a carbon cup having a hemispherical recess with a coaxial aperture extending therethrough, a flexible wire l... | 02/27/1979 |
| 3970804 | Electro-mechanical amplifier sound transducer This invention describes an electromechanical amplifying sound transducer including a diaphragm which responds to input energy, such as acoustical waves and mechanical pulses, and vibrates in response thereto. Conductive supports mounted onto the diaphrag... | 07/20/1976 |
| 3968332 | Toy carbon microphone A resistance microphone for a toy telephone mouthpiece includes a pair of circularly bored cylindrical carbon cups secured to a plastic sheet diaphragm in opposed spaced apart relationship and a cylindrical carbon rod having two conical ends held loosely ... | 07/06/1976 |
