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John W. Ledeboer received US Patent No. 1,866,856 on July 12, 1932, filed January 22, 1930. It was assigned to Ambler Asbestos Shingle & Shea.
The patent's description opens (from the scanned text):
This invention relates to boards or slabs of insulating material composed of Portland cement and an inertmaterial impregnated with an insulating compound to give a permalpent dielectric strength to the board or sla. i The obj ct of the invention is toprovide such a board or slab that will be inexpensive in manufacture and durable in use, and hav- 10 ing a fine smooth surfacefinish.
- Author
- John W. Ledeboer
- Published by
- US Patent Office
- Series
- US Patent No. 1,866,856
- Date
- July 12, 1932
- Library no.
- ACL Doc 23296 · asbestosclaims.law/library/23296
- Rights
- US government work, in the public domain.
Read or download
Read online Download the PDF PDF · 2 pages · 266 KB
Where it was listed
- Asbestos, August 1932, in its patents department (the year's issues)
Cite this document
John W. Ledeboer. “Panel Board (US Patent 1,866,856, 1932).” July 12, 1932. US Patent No. 1,866,856. US Patent Office. AsbestosClaims.Law Library, ACL Doc 23296. https://asbestosclaims.law/library/23296.
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