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Donald S. Bruce and Ralph T. Halstead received US Patent No. 2,227,424 on January 7, 1941, filed October 25, 1935. It was assigned to Johns Manville.
The patent's description opens (from the scanned text):
This invention relates to a friction composition and element and particularly to a friction material comprising reenforcing fibres and a binder composition therefor, of high coefflcient of friction and high resistance to excessive softening or fading at an elevated temperature.
- Author
- Donald S. Bruce; Ralph T. Halstead
- Published by
- US Patent Office
- Series
- US Patent No. 2,227,424
- Date
- January 7, 1941
- Library no.
- ACL Doc 22444 · asbestosclaims.law/library/22444
- Rights
- US government work, in the public domain.
Read or download
Read online Download the PDF PDF · 3 pages · 363 KB
Where it was listed
- Asbestos, February 1941, in its patents department (the year's issues)
Cited on this site
Cite this document
Donald S. Bruce, Ralph T. Halstead. “Friction Material (US Patent 2,227,424, 1941).” January 7, 1941. US Patent No. 2,227,424. US Patent Office. AsbestosClaims.Law Library, ACL Doc 22444. https://asbestosclaims.law/library/22444.
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