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Andrea Ehrhardt Otto Friedrich received US Patent No. 2,891,734 on June 23, 1959, filed September 6, 1955.
The patent's description opens (from the scanned text):
My invention relates to certain new and useful improvements in disintegrating asbestos ores and the like, and it has for one of its objects to provide an improved method for loosening and liberating the fibers or strands of fibers of asbestos contained in such ores without crushing and pulverizing them.
- Author
- Andrea Ehrhardt Otto Friedrich
- Published by
- US Patent Office
- Series
- US Patent No. 2,891,734
- Date
- June 23, 1959
- Library no.
- ACL Doc 22195 · asbestosclaims.law/library/22195
- Rights
- US government work, in the public domain.
Read or download
Read online Download the PDF PDF · 4 pages · 359 KB
Where it was listed
- Asbestos, October 1959, in its patents department (the year's issues)
Cite this document
Andrea Ehrhardt Otto Friedrich. “Disintegrating asbestos ores (US Patent 2,891,734, 1959).” June 23, 1959. US Patent No. 2,891,734. US Patent Office. AsbestosClaims.Law Library, ACL Doc 22195. https://asbestosclaims.law/library/22195.
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