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Witt Walter M. De received US Patent No. 1,521,603 on January 6, 1925, filed December 19, 1922. It was assigned to Johns Manville Inc.
The patent's description opens (from the scanned text):
My invention relates to the formation of gaskets by the process of winding up a sheet of material on a mandril to form a tube of proper thickness and then cutting such tube into sections to form flat rings of the thickness desired for the gaskets, and comprises certain improvements on such old process and the gaskets heretofore produced thereby.
- Author
- Witt Walter M. De
- Published by
- US Patent Office
- Series
- US Patent No. 1,521,603
- Date
- January 6, 1925
- Library no.
- ACL Doc 22336 · asbestosclaims.law/library/22336
- Rights
- US government work, in the public domain.
Read or download
Read online Download the PDF PDF · 3 pages · 272 KB
Where it was listed
- Asbestos, February 1925, in its patents department (the year's issues)
Cite this document
Witt Walter M. De. “Flat Gasket and Process of Making Same (US Patent 1,521,603, 1925).” January 6, 1925. US Patent No. 1,521,603. US Patent Office. AsbestosClaims.Law Library, ACL Doc 22336. https://asbestosclaims.law/library/22336.
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