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John B. Purinton received US Patent No. 2,518,640 on August 15, 1950, filed January 11, 1946.
The patent's description opens (from the scanned text):
This invention relates generally to composite insulation unitsl suitable for user in building walls and partitions, refrigeration and frozen storage units and structures, heat vprocessing rooms, sound regulating' rooms,l and the like.
- Author
- John B. Purinton
- Published by
- US Patent Office
- Series
- US Patent No. 2,518,640
- Date
- August 15, 1950
- Library no.
- ACL Doc 22737 · asbestosclaims.law/library/22737
- Rights
- US government work, in the public domain.
Read or download
Read online Download the PDF PDF · 5 pages · 418 KB
Where it was listed
- Asbestos, October 1950, in its patents department (the year's issues)
Cite this document
John B. Purinton. “Insulated building block (US Patent 2,518,640, 1950).” August 15, 1950. US Patent No. 2,518,640. US Patent Office. AsbestosClaims.Law Library, ACL Doc 22737. https://asbestosclaims.law/library/22737.
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