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Lyle Caldwell received US Patent No. 1,556,488 on October 6, 1925, filed January 29, 1923. It was assigned to Celite Co.
The patent's description opens (from the scanned text):
My invention relates in general to compositions employed for cement or mortar, and more particularly to those suitable for use in heat insulating constructions such as walls and coverings.
- Author
- Lyle Caldwell
- Published by
- US Patent Office
- Series
- US Patent No. 1,556,488
- Date
- October 6, 1925
- Library no.
- ACL Doc 22749 · asbestosclaims.law/library/22749
- Rights
- US government work, in the public domain.
Read or download
Read online Download the PDF PDF · 2 pages · 223 KB
Where it was listed
- Asbestos, November 1925, in its patents department (the year's issues)
Cite this document
Lyle Caldwell. “Insulating Cement or Mortar (US Patent 1,556,488, 1925).” October 6, 1925. US Patent No. 1,556,488. US Patent Office. AsbestosClaims.Law Library, ACL Doc 22749. https://asbestosclaims.law/library/22749.
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