发明授权
- 专利标题： Iron based roofing granules and method of coloring same
- 专利标题（中）： 铁基屋顶颗粒及其着色方法
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申请号： US150559申请日： 1993-11-10
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公开(公告)号： US6156289A公开(公告)日： 2000-12-05
- 发明人: Manjit S. Chopra , Michael D. Vick
- 申请人： Manjit S. Chopra , Michael D. Vick
- 申请人地址： AZ Tucson
- 专利权人： Minerals Research & Recovery, Inc.
- 当前专利权人： Minerals Research & Recovery, Inc.
- 当前专利权人地址： AZ Tucson
- 主分类号： C09C3/06
- IPC分类号： C09C3/06 ; E04D1/26 ; E04D5/12 ; E04D7/00 ; C01G49/02 ; E04D1/00
摘要：
Method of preparing colored roofing granules (18) from granulated mineral-containing matter having an elemental iron content of about 15% to about 70% is disclosed. The method comprises heating the granules (18) to a temperature of from about 450.degree. C. to about 1,000.degree. C. and maintaining the temperature for a period of time sufficient to effect a color change in the granules. The resulting oxidized granules are permanently colored and will not fade in use.
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