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PHOTO RES CORP

PHOTO RES
Active Patents
0
Total Holdings
3

Patent Holdings

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Patent No. Title Status Filing Date Grant Date Claims Actions
US2865247A Compound photometric device Expired / Lapsed 1955-10-10 1958-12-23 0 Details
US2755428A Regulated d. c. power supply Expired / Lapsed 1954-09-20 1956-07-17 0 Details
US2579661A Light measuring meter Expired / Lapsed 1949-04-28 1951-12-25 0 Details