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	Browse inventors by last name: Haber , Fritz Production of Ammonia Hall , Charles Martin Aluminum Charles Martin Hall discovered the electrolytic method of producing al . . . . Hall , Robert N. Magnetron Robert Hall invented the version of the magnetron that operates most m . . . . Hall , Lloyd Sterilizing Foodstuffs Food Preservatives Lloyd Hall was a pioneer in the field of food chemistry, creating many . . . . Hall , Thomas Seavey Improvement in Electrical Signals Hallidie , Andrew Cable car Hanford , William Edward Polyurethane William Edward Hanford and Donald Fletcher Holmes invented the process for making the multipurpose material polyurethane.They teamed up at . . . . Hazen , Elizabeth Lee Nystatin (Antifungal / Antibiotic) The world's first useful antifungal antibiotic, nystatin, was developed through a long-distance scientific collaboration. Working as researchers for the . . . . Heilman , M. Stephen Implantable Heart Defibrillator Stephen Heilman co-invented the automatic implantable defibrillator, a . . . . Heilmeier , George H. Electro-Optic Liquid Crystal Device George Heilmeier discovered four new electro-optic effects in liquid c . . . . Henry , Beulah Various inventions for daily use Beulah Henry became known as “Lady Edison” for the number and variety . . . . Hewlett , William R. Audio Signals Cofounder of the electronics giant . . . . Higonnet , Rene Alphonse Photo Composing Machine Louis Marius Moyroud and Rene Alphonse Higonnet developed the first pr . . . . Hilleman , Maruice Ralph Vaccines Hillier , James Electron Microscope Physicist James Hillier is recognized for his contributions to the dev . . . . Hoe , Richard M. Printing Press Hoerni , Jean A. Method of Manufacturing Semiconductor Devices Early in 1959 while at Fairchild Semiconductor, Jean Hoerni invented t . . . . Hoff Jr. , Marcian E. (Ted) CPU In the late 1960s, many articles had discussed the possibility of a co . . . . Hoffman , Felix Aspirin Hogan , Paul HDPE and Polypropylene Plastics Paul Hogan and fellow research chemist Robert Banks were working for P . . . . Holland , John Phillip Submarine Hollerith , Herman Punch Card Tabulator Herman Hollerith invented and developed a punch-card tabulation machine system that revolutionized statistical computation. Hollerith began working on the tabulating system during his days at MIT, filing for the first patent in 1884. He developed a hand-fed 'press' that sensed the holes in punched cards; a wire would pass through the holes into a cup of mercury beneath the card closing the electrical circuit. This process triggered mechanical counters and sorter bins and tabulated the appropriate data. Hollerith's system-including punch, tabulator, and sorter-allowed the official 1890 population count to be tallied in six months, and in another two years all the census data was completed and defined; the cost was $5 million below the forecasts and saved more than two years' time. His later machines mechanized the card-feeding process, added numbers, and sorted cards, in addition to merely counting data. In 1896 Hollerith founded the Tabulating Machine Company, forerunner of Computer Tabulating Recording Company (CTR). He served as a consulting engineer with CTR until retiring in 1921. In 1924 CTR changed its name to . . . . Holley , Alexander Steel making process in America Holly Jr. , Birdsill Modern day fire hydrant Holmes , Donald Fletcher Polyurethane William Edward Hanford and Donald Fletcher Holmes invented the process for making the multipurpose material polyurethane. Holmes teamed up with Edward Hanford at . . . . Holonyak Jr. , Nick LED First LED in the Visual Spectrum Holt , Benjamin Traction-Engine Hood , Leroy E. DNA Sequencer Hoover , Erna Computerized Telephone Switching Electronic Switching Central Processor Overload Control Hornbeck , Larry J. Spatial Light Modulator and Method Larry Hornbeck is the inventor of the Digital Micromirror Device, an a . . . . Houdry , Eugene Catalytic Cracking Eugene Houdry discovered a revolutionary method for cracking low-grade . . . . Hounsfield , Godrey Newbold CT Scan Howe , Elias Sewing Machine Elias Howe invented the first practical sewing machine. Born in Spence . . . . Hulett , George Loading and unloading machine Hunt , Walter Safety pin Hyatt , John Celluloid Hyde , J. Franklin Transparent Silica A periodic chart that Franklin Hyde once designed had the element sili . . . .