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James G. Needham and Peter W. Claassen received US Patent No. 1,491,725 on April 22, 1924.
The patent's description opens (from the scanned text):
This invention relates to a new and im` proved article of'manufacture, and has for an object the provision of an article of manufacture especially adaptable for use as a heat insulating material and as a buoyant medium.
- Author
- James G. Needham; Peter W. Claassen
- Published by
- US Patent Office
- Series
- US Patent No. 1,491,725
- Date
- April 22, 1924
- Library no.
- ACL Doc 22621 · asbestosclaims.law/library/22621
- Rights
- US government work, in the public domain.
Read or download
Read online Download the PDF PDF · 3 pages · 288 KB
Where it was listed
- Asbestos, July 1924, in its patents department (the year's issues)
Cite this document
James G. Needham, Peter W. Claassen. “Heat Insulating Material and process of producing same (US Patent 1,491,725, 1924).” April 22, 1924. US Patent No. 1,491,725. US Patent Office. AsbestosClaims.Law Library, ACL Doc 22621. https://asbestosclaims.law/library/22621.
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