Appeal No. 1997-0569
Application No. 08/150,559
APPENDIX
1. A method of preparing colored roofing granules from
granulated mineral-containing matter comprising slag having an
iron content of about 15% to about 70% by weight and being
sized so that approximately 100% of said granulated matter
will pass through a number 8 U.S. Standard Sieve and no more
than approximately 2% will pass through a number 40 U.S.
Standard Sieve, said method comprising the steps of:
heating said granules to a temperature of from about
450°C to about 1000°C; and
maintaining said temperature for a period of time
sufficient to cause oxidation of said iron to effect a
color change in said granules and thereby form said
colored roofing granules.
7. A product for use in providing a surface coating for
composition roofing materials, said product comprising:
granulated mineral-containing matter comprising slag
having an initial elemental iron content of about 15% to
about 70% by weight, said iron having been heated to a
temperature of about 450°C to about 1,000°C for a period of
time sufficient to cause oxidation of said iron and produce a
change in color of said matter.
13. A roofing material comprising:
a man-made composition substrate; and
a granulated mineral-containing matter forming a
surface coating for said substrate,
said matter comprising slag having an initial
elemental
iron content of about 15% to about 70% by weight, said iron
having been heated to a temperature of about 450°C to about
1,000°C for a period of time sufficient to oxidize said iron
and cause a change in color of said matter.
A-1
Page: Previous 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 Next
Last modified: November 3, 2007