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 |
| 7038576 | Electropneumatic horn An electropneumatic acoustic horn is disclosed, comprising an electric compressor unit for generating compressed air and a sound wave generator comprising at least an acoustic chamber associated to at least a volute wound acoustic duct adapted to propagate the produ... | 05/02/2006 |
| 6081184 | Self-protected, low emission electronic device for driving a warning horn A self-protected, low emission electronic device for driving a warning horn includes a coil powered from a battery through a control push-button adapted for operation by a user and included in an electric connection between a terminal of the coil and the ... | 06/27/2000 |
| 5457437 | Sparking free circuit of electric horn An electric horn which comprises a diaphragm held at its peripheral portion in a housing of the horn and having an armature attached to a middle portion thereof; an electromagnet having a coil and disposed adjacent to the armature in an opposed relationsh... | 10/10/1995 |
| 4694290 | Readiness indicator for laser medical instruments Readiness for operation of laser medical instruments or of flash generators for ophthalmological instruments is indicated in such a way that the readiness signal is perceptible only to the physician and not to the patient being operated upon. There is a m... | 09/15/1987 |
| 4664055 | Alarm horn An alarm horn includes a one-piece molded body which includes a casing portion having opposite open ends, and a first horn disposed in the casing portion and having opposite open ends. The first horn is connected to the casing portion at their one ends. A... | 05/12/1987 |
| 4540975 | Electric horns An electromagnet is formed of a combination of an iron support, an iron piece, and a solenoid, and an interrupter is provided to intermittently excite said electromagnet. A cylindrical diaphragm, equipped with an armature so disposed as to come against sa... | 09/10/1985 |
| 4398182 | Electromagnetic horn An electromagnetic horn has a diaphragm, tone disc, spacer and mass which are clamped together between an abutment shoulder and an annular rib on an internally screw-threaded sleeve, the annular rib being produced by deformation of the sleeve after the af... | 08/09/1983 |
| 4396908 | Electromagnetic warning instrument An electromagnetic warning instrument has a housing equipped with at least one core carrying an operating electric coil, and a contact-breaker cooperating with a vibrating armature fast with a diaphragm. The coil is mounted on a printed circuit and electr... | 08/02/1983 |
| 4275389 | Electrical assembly An electrical horn has a hollow body fitted with a diaphragm secured to an armature. A self-supporting coil is disposed with clearance in a recess in the body. The coil has no central former but is provided with upper and lower electrically insulating fla... | 06/23/1981 |
| 4250497 | Vibration-resistant coupling for insulated electrical conductor An insulated wire subjected to mechanical vibrations, such as a supply lead or an electromagnetic coil of an automobile horn or other sound generator, is partly received in a groove of a conductive connector plate overlain by a conductive or nonconductive ... | 02/10/1981 |
