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Research Frontiers Inc

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Active Patents

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Total Holdings

5

Patent Holdings

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Patent No.	Title	Status	Filing Date	Grant Date	Claims	Actions
US4078856A	Light valve	Expired / Lapsed	1976-03-17	1978-03-14	14	Details
US3756700A	Method and apparatus for increasing optical density ratios …	Expired / Lapsed	1972-02-09	1973-09-04	20	Details
US3742600A	Method for maintaining the separation of plates	Expired / Lapsed	1971-07-26	1973-07-03	12	Details
US3708219A	Light valve with flowing fluid suspension	Expired / Lapsed	1971-08-24	1973-01-02	30	Details
US3655267A	Light valves with high frequency excitation	Expired / Lapsed	1970-04-01	1972-04-11	5	Details