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Ralph S. Frobisher received US Patent No. 1,921,518 on August 8, 1933, filed February 19, 1930. It was assigned to Bemis Industries Inc.
The patent's description opens (from the scanned text):
This invention relates to a new building block and more particularly to a block of this character which is formed of fibers suspended in a liquid such as water to compose a pulp analogous 5 to that used in the manufacture of paper or fiber board.
- Author
- Ralph S. Frobisher
- Published by
- US Patent Office
- Series
- US Patent No. 1,921,518
- Date
- August 8, 1933
- Library no.
- ACL Doc 22741 · asbestosclaims.law/library/22741
- Rights
- US government work, in the public domain.
Read or download
Read online Download the PDF PDF · 4 pages · 386 KB
Where it was listed
- Asbestos, September 1933, in its patents department (the year's issues)
Cite this document
Ralph S. Frobisher. “Insulating Block (US Patent 1,921,518, 1933).” August 8, 1933. US Patent No. 1,921,518. US Patent Office. AsbestosClaims.Law Library, ACL Doc 22741. https://asbestosclaims.law/library/22741.
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