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	Browse Inventions: Electret Microphone Electroacoustic Transducer Gerhard Sessler and James West invented the foil electret microphone w . . . . Electret Microphone Electroacoustic Transducer In 1962, James West and Gerhard Sessler patented the electret micropho . . . . Electric Field Controlled Semiconductor Device Electric Field Controlled Semiconductor Device Dawon Kahng was an inventor of the first practical field-effect transi . . . . Electric fire alarm system Electric Lamp Incandescent Electric Lamp Irving Langmuir's work led to two major inventions: the high-vacuum el . . . . Electric Lamp Electric Lamp One of the outstanding geniuses in the history of technology, Thomas Edison earned patents for more than a thousand inventions, including the incandescent electric lamp, the phonograph, the carbon telephone transmitter, and the motion-picture projector. In addition, he created the world's first industrial research laboratory. In September 1878, after having viewed an exhibition of a series of eight glaring 500-candlepower arc lights, Edison boldly announced he would invent a safe, mild, and inexpensive electric light that would replace the gaslight in millions of homes; moreover, he would accomplish this by an entirely different method of current distribution from that used for arc lights. To back the lamp effort, some of New York's leading financial figures joined with Edison in October 1878 to form the Edison Electric Light Company, the predecessor of today's . . . . Electric street car Electric Telegraphy Electric-Arc Lamp Electrocardiograph Electrocardiograph Receiving of Wireless Signals Electron Microscope Electron Lens Correction Device Physicist James Hillier is recognized for his contributions to the dev . . . . Electron Optical System Electron Holography Dennis Gabor is known for his research in electron optics which led to . . . . Electronic Still Camera Digital Camera In 1974, Kodak supervisor Gareth Lloyd asked electrical engineer Steve . . . . Electro-Optic Liquid Crystal Device Electro-Optic Liquid Crystal Device George Heilmeier discovered four new electro-optic effects in liquid c . . . . Electrophotography (Xerox) / Instant Copying Electrophotography Physicist Chester F. Carlson, the father of xerographic printing, was born in Seattle, Washington. Plagued by needs for copies of patent drawings and specifications, Carlson investigated ways of automatic text and illustration reproduction, working out of his apartment. While others sought chemical or photographic solutions to 'instant copying' problems, Carlson turned to electrostatics and in 1938 succeeded in obtaining his first 'dry-copy' and the first of many patents two years later. It took presentations to more than 20 companies before Carlson was able to interest the . . . . Electrostatic Precipitator Art of Separating Suspended Particles from Gaseous Bodies As industrial smokestacks became a common sight at the turn of the cen . . . . Electrothermal Hydrazine Resistojet Dual Thrust Level Monopropellant Spacecraft Propulsion System Yvonne Brill is known for her innovations in rocket propulsion. Her mo . . . . Elevator Brake Improvement in Hoisting Apparatus Elisha Graves Otis didn't invent the elevator, he invented something p . . . . Embolectomy Catheter Embolectomy Catheter In 1963, Thomas Fogarty received a patent for his Fogarty® balloon . . . . ENIAC Data Translating Apparatus ENIAC Data Translating Apparatus ePTFE, known by the GORE-TEX® brand name Erasable programmable read only memory array EPROM Dov Frohman-Bentchkowsky invented a computer chip that could be erased . . . . Escalator Escalator Ethernet Ethyl Gasoline Motor Fuel Knock was a destructive phenomenon that occurred in internal combustio . . . . Excimer Laser Surgery Far Ultraviolet Surgical and Dental Procedures In 1981, Rangaswamy Srinivasan discovered that an ultraviolet excimer . . . . Explosion and Combustion Motor