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William R. Seigle received US Patent No. 1,444,396 on February 6, 1923, filed October 5, 1921.
The patent's description opens (from the scanned text):
My invention relates to the manufacture of heat-insulating materials, and consists bf a method by which a sheetemember adapted to be incorporated in a heat-insulating structure, and comprising features which contribute cellular constitution to the completed structure, .may be economically and expe ditiously constructed out of plastic sheet material which, when finally setwould be practically incapable of assuming under mechanical manipulation, the desired and characteristic structural features.
- Author
- William R. Seigle
- Published by
- US Patent Office
- Series
- US Patent No. 1,444,396
- Date
- February 6, 1923
- Library no.
- ACL Doc 23053 · asbestosclaims.law/library/23053
- Rights
- US government work, in the public domain.
Read or download
Read online Download the PDF PDF · 5 pages · 377 KB
Where it was listed
- Asbestos, April 1923, in its patents department (the year's issues)
Cite this document
William R. Seigle. “Method of Forming Heat Insulating Sheet Material (US Patent 1,444,396, 1923).” February 6, 1923. US Patent No. 1,444,396. US Patent Office. AsbestosClaims.Law Library, ACL Doc 23053. https://asbestosclaims.law/library/23053.
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