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Robert S. Blair received US Patent No. 1,489,340 on April 8, 1924, filed August 9, 1921.
The patent's description opens (from the scanned text):
This invention relates to heat insulating material and more particularly to blocks of such material used as insulation for appliances which are to be kept at low tempera ture.
- Author
- Robert S. Blair
- Published by
- US Patent Office
- Series
- US Patent No. 1,489,340
- Date
- April 8, 1924
- Library no.
- ACL Doc 22659 · asbestosclaims.law/library/22659
- Rights
- US government work, in the public domain.
Read or download
Read online Download the PDF PDF · 4 pages · 391 KB
Where it was listed
- Asbestos, July 1924, in its patents department (the year's issues)
Cite this document
Robert S. Blair. “Heat Insulation and process of making same (US Patent 1,489,340, 1924).” April 8, 1924. US Patent No. 1,489,340. US Patent Office. AsbestosClaims.Law Library, ACL Doc 22659. https://asbestosclaims.law/library/22659.
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