Greenleaf Whittier Pickard
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Greenleaf Whittier Pickard (February 14, 1877, Portland, Maine - January 8, 1956, Newton, Massachusetts) was a United States radio pioneer.
Pickard was a researcher in the early days of wireless. He experimented with crystal detectors, used in crystal radio receivers. On August 30, 1906 he filed a patent for a silicon crystal detector, which was granted on November 20, 1906 [1].
Pickard's detector was revolutionary in that he found that a fine pointed wire known as a "cat's whisker", in delicate contact with a mineral produced the best semiconductor effect.
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Patents
- Template:US patent - Electrostatic separation
- Template:US patent - Electrostatic separation
- Template:US patent - Electrostatic separation
- Template:US patent - Electrostatic separation
- Template:US patent - Means for receiving intelligence communicated by electric waves (silicon detector), 1906
- Template:US patent - Electrostatic separator,1907
- Template:US patent - Means for receiving intelligence communicated by electric waves (copper sulfate solution detector), 1907
- Template:US patent - Intelligence intercommunication by magnetic wave component, 1908
- Template:US patent - Means for receiving intelligence communicated by electric waves (spring-loaded detector contact), 1908
- Template:US patent - Oscillation receiver (fused zinc oxide detector), 1908
- Template:US patent - Oscillation receiver (polished silicon detector, 1908
- Template:US patent - Oscillation detecting means (molybdenite detector), 1908
- Template:US patent - Oscillation detector and rectifier ("plated" silicon carbide detector with DC bias), G.W. Pickard, 1909
- Template:US patent - Oscillation receiver (fractured surface red zinc oxide (zincite) detector), 1909
- Template:US patent - Oscillation device (iron pyrite detector), 1909
- Template:US patent - Detector for wireless telegraphy and telephony (looped or humped springy wire detector contact), 1914
- Template:US patent - Oscillation detectors (pairs of minerals), 1914
- Template:US patent - Valve detector for wireless (vacuum tube with conducting shield to drain static), 1915
- Template:US patent - Receiver for wireless telephony and telegraphy (interrupted or switched circuit instead of rectifier), 1916
- Template:US patent - Means for receiving intelligence communicated by electric waves (receiving circuit, divided from #836531), 1917
- Template:US patent - Optical selection of split mica sheets
- Template:US patent - Distinguishing dielectric sheets
- Template:US patent - Extreme loading condenser
Reissued
- Template:US patent - Means for receiving intelligence communicated by electric waves
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