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Charles E. Stiefken received US Patent No. 3,644,138 on February 22, 1972, filed October 27, 1969.
The patent's abstract:
Asbestos fiber having aluminum sulfate deposited on its surfaces and especially well suited for forming fast-filtering asbestoscement slurries, the preparation of such fiber, and the production of water-laid asbestos-cement products involving the formation of the fast-filtering asbestos-cement slurries utilizing the asbestos fiber having the aluminum sulfate previously deposited thereon. Such asbestos fiber product is preferably dry but can be only partially dry or wet.
- Author
- Charles E. Stiefken
- Published by
- US Patent Office
- Series
- US Patent No. 3,644,138
- Date
- February 22, 1972
- Library no.
- ACL Doc 23027 · asbestosclaims.law/library/23027
- Rights
- US government work, in the public domain.
Read or download
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Where it was listed
- Asbestos, August 1972, in its patents department (the year's issues)
Cited on this site
Cite this document
Charles E. Stiefken. “Method for preparing an asbestos fiber product of improved filtration characteristics (US Patent 3,644,138, 1972).” February 22, 1972. US Patent No. 3,644,138. US Patent Office. AsbestosClaims.Law Library, ACL Doc 23027. https://asbestosclaims.law/library/23027.
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