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Walworth Co

Walworth C

Active Patents

0

Total Holdings

4

Patent Holdings

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Patent No.	Title	Status	Filing Date	Grant Date	Claims	Actions
US3128785A	Check valve for relatively large size pipes	Expired / Lapsed	1961-03-15	1964-04-14	2	Details
US3033227A	Ball valve	Expired / Lapsed	1960-03-25	1962-05-08	0	Details
US2796230A	Valve construction	Expired / Lapsed	1951-03-23	1957-06-18	0	Details
US2690765A	Hydraulic operating apparatus	Expired / Lapsed	1951-07-14	1954-10-05	0	Details