| I920 |
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| 1921 |
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| 1922 |
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| 1923 |
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Garrett A. Morgan invents a traffic signal.
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The television or iconoscope (cathode-ray tube) invented by Vladimir Kosma Zworykin.
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John Harwood invented the self-windingwatch in 1923.
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Clarence Birdseye invents frozen food.
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| 1924 |
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| 1925 |
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The mechanical television a precursor to the modern television, invented by John Logie Baird.
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| 1926 |
Robert H. Goddard invents liquid-fueled rockets. |
| 1927 |
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Eduard Haas III invents PEZ candy.
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JWA Morrison invents the first quartz crystal watch.
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Philo Taylor Farnsworth invents a complete electronic TV system.
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Technicolor invented.
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Erik Rotheim patents an aerosol can.
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Warren Marrison developed the first quartz clock.
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Philip Drinker invents the iron lung.
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| 1928 |
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Scottish biologist Alexander Fleming discovers penicillin.
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Bubble gum invented by Walter E. Diemer.
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Jacob Schick patented the electric shaver.
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| 1929 |
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| 1930 |
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Scotch tape patented by 3M engineer, Richard G. Drew.
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The frozen food process patented by Clarence Birdseye.
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Wallace Carothers and DuPont Labs invents neoprene.
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The "differential analyzer", or analog computer invented by Vannevar Bush at MIT in Boston.
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Frank Whittle and Dr Hans von Ohain both invent a jet engine.
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