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FIRM FERNSEH AG

FIRM FERNS

Active Patents

0

Total Holdings

5

Patent Holdings

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Patent No.	Title	Status	Filing Date	Grant Date	Claims	Actions
US2250293A	Contrast control for television systems	Expired / Lapsed	1938-07-23	1941-07-22	0	Details
US2230134A	Image analyzing tube	Expired / Lapsed	1938-01-12	1941-01-28	0	Details
US2171918A	Amplitude filter	Expired / Lapsed	1937-04-21	1939-09-05	0	Details
US2172324A	Modulation circuit using a multigrid photoelectric cell	Expired / Lapsed	1936-12-11	1939-09-05	0	Details
US2160510A	Cathode ray tube with photocell mosaic	Expired / Lapsed	1936-11-06	1939-05-30	0	Details