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US 4,513,045 AGranted
Sheet type felt
AssigneeGAF Corporation
InventorsAlfredo A. Bondoc, Eugene J. Flood, Frederick W. Sieling
Life of this patent
Estimating the term…
Abstract
Sheet type felt material comprising 5-20 wt % glass fibers, 40-80 wt % cellulosic fibers, 5-25% binder and 3-20 wt % asphalt. The felt is made on conventional felt making equipment and may be used as siding or roofing underlayment or as facer for foam insulating boards.
Claims8
Rigid foamed insulation board comprising:
- (a) a rigid closed cell foam core;
- and
- (b) sheet type felt adhered to a face of said core, said felt comprising on a dry basis:
- (1) between about 40 and about 80 wt % cellulosic fibers;
- (2) between about 5 and about 20 wt % glass fibers;
- (3) between about 5 and about 15 wt % binder;
- and
- (4) between about 3 and about 20 wt % asphalt.
5 more elements
Dependencies are inferred from the claim text.