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* [https://patents.google.com/patent/US1811357A/en US Patent 1811357, Eduard Karplus, ''Wireless signaling apparatus'']. Filed 1929-03-11; Granted 1931-06-23 | * [https://patents.google.com/patent/US1811357A/en US Patent 1811357, Eduard Karplus, ''Wireless signaling apparatus'']. Filed 1929-03-11; Granted 1931-06-23 | ||
* [https://patents.google.com/patent/US1916224A/en US Patent 1916224, Eduard Karplus, ''Self-contained oscillator tube'']. Filed 1929-12-09; Granted 1933-07-04 | * [https://patents.google.com/patent/US1916224A/en US Patent 1916224, Eduard Karplus, ''Self-contained oscillator tube'']. Filed 1929-12-09; Granted 1933-07-04 | ||
* [https://patents.google.com/patent/US2009013A/en US Patent 2009013, Eduard Karplus, ''Alternating-current apparatus'']. Filed 1934-06-01; Granted 1935-07-23 (the [[ | * [https://patents.google.com/patent/US2009013A/en US Patent 2009013, Eduard Karplus, ''Alternating-current apparatus'']. Filed 1934-06-01; Granted 1935-07-23 (the [[Variac]] patent) | ||
* [https://patents.google.com/patent/US2367681A/en US Patent 2367681, Eduard Karplus, ''Ultra-high-frequency tuning apparatus'']. Filed 1941-12-10; Granted 1945-01-23 | * [https://patents.google.com/patent/US2367681A/en US Patent 2367681, Eduard Karplus, ''Ultra-high-frequency tuning apparatus'']. Filed 1941-12-10; Granted 1945-01-23 | ||
* [https://patents.google.com/patent/US2578429A/en US Patent 2578429, Eduard Karplus, ''Ultrahigh-frequency tuning apparatus'']. Filed 1945-12-19; Granted 1951-12-11 | * [https://patents.google.com/patent/US2578429A/en US Patent 2578429, Eduard Karplus, ''Ultrahigh-frequency tuning apparatus'']. Filed 1945-12-19; Granted 1951-12-11 |