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Arthur B. Cummins and August M. Dinkfeld received US Patent No. 2,428,555 on October 7, 1947, filed March 27, 1943. It was assigned to Johns Manville.
The patent's description opens (from the scanned text):
This invention relates to the manufacture of magnesia insulation, and is particularly directed to improvements in method and apparatus whereby magnesia insulation blocks and other shapes may be produced by a continuous or semicontinuous extrusion operation.
- Author
- Arthur B. Cummins; August M. Dinkfeld
- Published by
- US Patent Office
- Series
- US Patent No. 2,428,555
- Date
- October 7, 1947
- Library no.
- ACL Doc 22928 · asbestosclaims.law/library/22928
- Rights
- US government work, in the public domain.
Read or download
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Where it was listed
- Asbestos, December 1947, in its patents department (the year's issues)
- Barry Castleman, Asbestos: Medical and Legal Aspects (5th edition, 2005)
Cited by Barry Castleman
In Asbestos: Medical and Legal Aspects (5th edition, 2005), which cites it in:
- Chapter 6 (Alternatives to Asbestos Insulation), p. 373, note 15
Cited on this site
Cite this document
Arthur B. Cummins, August M. Dinkfeld. “Magnesia Insulation (US Patent 2,428,555, 1947).” October 7, 1947. US Patent No. 2,428,555. US Patent Office. AsbestosClaims.Law Library, ACL Doc 22928. https://asbestosclaims.law/library/22928.
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