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Hrb-Singer Inc

Hrb-Singer

Active Patents

0

Total Holdings

5

Patent Holdings

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Patent No.	Title	Status	Filing Date	Grant Date	Claims	Actions
US3444386A	Rotary scanner imaging device with mirrors mounted therein …	Expired / Lapsed	1966-09-29	1969-05-13	2	Details
US3383920A	Circuit for making temperature measurements	Expired / Lapsed	1965-04-08	1968-05-21	0	Details
US3188631A	Electronic plotting board	Expired / Lapsed	1962-04-02	1965-06-08	2	Details
US3177595A	Teaching device	Expired / Lapsed	1962-11-13	1965-04-13	2	Details
US3057082A	Test scoring, recording, and teaching apparatus	Expired / Lapsed	1961-03-21	1962-10-09	0	Details