Plastic and nonmetallic article shaping or treating: processes – Mechanical shaping or molding to form or reform shaped article – Shaping against forming surface
Patent
1978-01-09
1979-06-26
Lesmes, George F.
Plastic and nonmetallic article shaping or treating: processes
Mechanical shaping or molding to form or reform shaped article
Shaping against forming surface
106 90, 106 97, 106 99, 106DIG2, 428920, 428537, 428538, B28B 300, B32B 1310, B32B 1312
Patent
active
041593022
ABSTRACT:
A fire door core in which the major ingredient is expanded perlite and including, as minor ingredients, set gypsum, set hydraulic cement and an organic binder, and having a density of no greater than about 30 lbs. per cubic foot, and preferably including unexpanded vermiculite, clay, and fibrous reinforcements, and a process for making said fire door core, and also a fire door including said core.
REFERENCES:
patent: 3203813 (1965-08-01), Gajardo et al.
patent: 3372040 (1968-03-01), Ware
patent: 3502490 (1970-03-01), Ware
patent: 3565650 (1971-02-01), Cordon
patent: 3847633 (1974-11-01), Race
patent: 3853689 (1974-12-01), Morrone
patent: 4067939 (1978-01-01), Lowe et al.
Greve Dale R.
Richards Turner W.
Georgia-Pacific Corporation
Hess Bruce H.
Lesmes George F.
Synnestvedt John T.
Synnestvedt Kenneth P.
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