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Clarence E. Albertson and Howard S. Okubo received US Patent No. 3,647,722 on March 7, 1972, filed November 24, 1967.
The patent's abstract:
A METHOD OF MANUFACTURING FRICTION MATERIALS AND/OR ELEMENTS BY FELTING A SLURRY CONTAINING 70-100 PERCENT ASBESTOS FIBERS AND 0-30 PERCENT (BASED ON DRY INGREDIENTS) OF A FRICTION MODIFIER SUCH AS BARYTES, CASHEW NUT SHELL RESIN GRANULES OR OTHER NON-CELLULOSIC FIBERS. A SLURRY IS MADE BY MIXING THE DRY INGREDIENTS WITH PHENOLIC, VARNISH-TYPE RESIN DISSOLVED IN A SUITABLE SOLVENT. THE AMOUNT OF RESIN IN THE SOLUTION IS ADJUSTED TO ASSURE THAT THE FINAL MATERIAL HAS A RESIN CONTENT OF 15-35 PERCENT. THE SOLVENT IS EVAPORATED FROM THE FELTED MATERIAL BY DRYING AND THEN THE RESIN IS SET BY HEATING AT A HIGHER TEMPERATURE. METHODS OF FORMING COATED FRICTION ELEMENTS ARE ALSO DESCRIBED.
- Author
- Clarence E. Albertson; Howard S. Okubo
- Published by
- US Patent Office
- Series
- US Patent No. 3,647,722
- Date
- March 7, 1972
- Library no.
- ACL Doc 22468 · asbestosclaims.law/library/22468
- Rights
- US government work, in the public domain.
Read or download
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Where it was listed
- Asbestos, August 1972, in its patents department (the year's issues)
Cited on this site
Cite this document
Clarence E. Albertson, Howard S. Okubo. “Friction elements and methods of their manufacture (US Patent 3,647,722, 1972).” March 7, 1972. US Patent No. 3,647,722. US Patent Office. AsbestosClaims.Law Library, ACL Doc 22468. https://asbestosclaims.law/library/22468.
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