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Henry Pratt Co LLC

Henry Prat

Active Patents

0

Total Holdings

5

Patent Holdings

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Patent No.	Title	Status	Filing Date	Grant Date	Claims	Actions
US2991043A	Resilient valve seat liner	Expired / Lapsed	1955-10-07	1961-07-04	0	Details
US2941779A	Rotary valve	Expired / Lapsed	1957-01-07	1960-06-21	0	Details
US2586927A	Butterfly valve	Expired / Lapsed	1945-08-22	1952-02-26	0	Details
US2540300A	Self-cleaning strainer for liquids	Expired / Lapsed	1948-02-07	1951-02-06	0	Details
US2236056A	Apparatus and method of making corrugated board	Expired / Lapsed	1938-02-04	1941-03-25	0	Details