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Robert C. Pomerhn and Robert M. Johnson received US Patent No. 3,985,610 on October 12, 1976, filed January 7, 1974. It was assigned to National Gypsum Co.
The patent's abstract:
An improved low density asbestos-cement product and the process whereby it is produced wherein an asphalt emulsion is combined with the formulation from which the product is made, which asphalt emulsion has an asphalt phase which asphalt has a softening point of at least 150°F and is dispersed in water in globules all smaller than 10 microns.
- Author
- Robert C. Pomerhn; Robert M. Johnson
- Published by
- US Patent and Trademark Office
- Series
- US Patent No. 3,985,610
- Date
- October 12, 1976
- Library no.
- ACL Doc 23848 · asbestosclaims.law/library/23848
- Rights
- US government work, in the public domain.
Read or download
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Where it was listed
- Asbestos, February 1977, in its patents department (the year's issues)
Cite this document
Robert C. Pomerhn, Robert M. Johnson. “Water-resistant asbestos-cement (US Patent 3,985,610, 1976).” October 12, 1976. US Patent No. 3,985,610. US Patent and Trademark Office. AsbestosClaims.Law Library, ACL Doc 23848. https://asbestosclaims.law/library/23848.
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