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Charles L. Blake received US Patent No. 2,785,987 on March 19, 1957, filed November 25, 1952.
The patent's description opens (from the scanned text):
This invention relates to cementitious material such as used for roofing or siding and it has for its primary object to provide a cementitious material containing a relatively high percentage of finely ground slate, socalled slate flour, which is a waste material resulting either from the working of slate or from the grinding of slate material which cannot be worked.
- Author
- Charles L. Blake
- Published by
- US Patent Office
- Series
- US Patent No. 2,785,987
- Date
- March 19, 1957
- Library no.
- ACL Doc 22020 · asbestosclaims.law/library/22020
- Rights
- US government work, in the public domain.
Read or download
Read online Download the PDF PDF · 2 pages · 208 KB
Where it was listed
- Asbestos, April 1957, in its patents department (the year's issues)
Cite this document
Charles L. Blake. “Cementitious material containing slate flour (US Patent 2,785,987, 1957).” March 19, 1957. US Patent No. 2,785,987. US Patent Office. AsbestosClaims.Law Library, ACL Doc 22020. https://asbestosclaims.law/library/22020.
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