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Sparks Withington Co

Sparks Wit

Active Patents

0

Total Holdings

5

Patent Holdings

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Patent No.	Title	Status	Filing Date	Grant Date	Claims	Actions
US2228677A	Warning signal	Expired / Lapsed	1938-06-11	1941-01-14	0	Details
US2006771A	Electric tube evaporating apparatus	Expired / Lapsed	1931-07-13	1935-07-02	0	Details
US1815165A	Control knob for condensers	Expired / Lapsed	1929-10-30	1931-07-21	0	Details
US1421734A	Commutator	Expired / Lapsed	1920-07-16	1922-07-04	0	Details
US1072189A	Rotary fan.	Expired / Lapsed	1911-10-17	1913-09-02	0	Details