Printed matter – Method – Identifying
Patent
1986-06-30
1988-02-16
Bell, Paul A.
Printed matter
Method
Identifying
52105, 283 1R, D42D 1500
Patent
active
047250780
ABSTRACT:
Gypsum wallboard, for use in drywall construction, printed with suitable identifying indicia on the face using an optical brightener which is visible only under ultra-violet light. The wallboard is identifiable as to source, after the board is installed, and even after having been painted.
REFERENCES:
patent: 2270419 (1942-01-01), Debo
patent: 4157784 (1979-06-01), Grottrup et al.
Bell Paul A.
Hause Robert F.
National Gypsum Company
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