Essentially, he referred to all his vacuum tube designs as Kenotrons, the Pliotron basically being a specialized type of Kenotron.
2.
However, because Pliotron and Kenotron were registered trademarks, technical writers tended to use the more generic term " vacuum tube ".
3.
He helped to develop the Kenotron and Pliotron, two-and three-electrode vacuum tubes, which could be exhausted to an exceedingly high vacuum.
4.
By the mid-1920s, the term " Kenotron " had come to exclusively refer to vacuum tube rectifiers, while the term " Pliotron " had fallen into disuse.
5.
To distinguish his device from the Audion he named it the " Pliotron ", from the Greek " plio " ( more or extra, in this sense meaning gain, more signal coming out than went in ).
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