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NAT TECHNICAL LAB

NAT TECHNI

Active Patents

0

Total Holdings

4

Patent Holdings

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Patent No.	Title	Status	Filing Date	Grant Date	Claims	Actions
US2495072A	Vacuum tube circuit	Expired / Lapsed	1949-01-03	1950-01-17	0	Details
US2346470A	Method of making glass electrodes	Expired / Lapsed	1940-08-02	1944-04-11	0	Details
US2232212A	Apparatus for amplifying direct current voltages and curren…	Expired / Lapsed	1940-01-17	1941-02-18	0	Details
US2232211A	Automatic voltage and ph indicator	Expired / Lapsed	1938-12-06	1941-02-18	0	Details