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National Gypsum Co

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Active Patents

0

Total Holdings

4

Patent Holdings

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Patent No.	Title	Status	Filing Date	Grant Date	Claims	Actions
US4590733A	Curtain wall panel and method	Expired / Lapsed	1985-05-28	1986-05-27	4	Details
US3671061A	Gypsum board fastener	Expired / Lapsed	1970-07-02	1972-06-20	3	Details
US3323262A	Z-bar frame assembly	Expired / Lapsed	1964-12-10	1967-06-06	2	Details
US2675841A	Drill	Expired / Lapsed	1951-07-28	1954-04-20	0	Details