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Donald A. Cumfer received US Patent No. 2,224,810 on December 10, 1940, filed November 29, 1937.
The patent's description opens (from the scanned text):
My invention relates to air-cell pipe coverings and methods of forming the same, more particularly the invention relatesto a continuous process of manufacturing air-cell insulating pipe coverings from corrugated asbestos or similar fibrous sheet material, and has for an object the provision of a simple and reliable process and a highly efficient and inexpensive product of this character.
- Author
- Donald A. Cumfer
- Published by
- US Patent Office
- Series
- US Patent No. 2,224,810
- Date
- December 10, 1940
- Library no.
- ACL Doc 21656 · asbestosclaims.law/library/21656
- Rights
- US government work, in the public domain.
Read or download
Read online Download the PDF PDF · 6 pages · 606 KB
Where it was listed
- Asbestos, January 1941, in its patents department (the year's issues)
Cite this document
Donald A. Cumfer. “Air Cell Pipe Covering (US Patent 2,224,810, 1940).” December 10, 1940. US Patent No. 2,224,810. US Patent Office. AsbestosClaims.Law Library, ACL Doc 21656. https://asbestosclaims.law/library/21656.
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