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Robert Warren Campbell received US Patent No. 3,382,541 on May 14, 1968, filed June 24, 1965.
The patent's description opens:
This invention relates to apparatus for producing thermally insulated pipe and, more particularly, is directed to apparatus for producing thermally insulated pipe wherein the thermal insulation comprises a material that is foamed in place between two coaxial pipes.
- Author
- Robert Warren Campbell
- Published by
- US Patent Office
- Series
- US Patent No. 3,382,541
- Date
- May 14, 1968
- Library no.
- ACL Doc 23349 · asbestosclaims.law/library/23349
- Rights
- US government work, in the public domain.
Read or download
Read online Download the PDF PDF · 6 pages · 574 KB
Where it was listed
- Asbestos, July 1968, in its patents department (the year's issues)
Cite this document
Robert Warren Campbell. “Pipe apparatus (US Patent 3,382,541, 1968).” May 14, 1968. US Patent No. 3,382,541. US Patent Office. AsbestosClaims.Law Library, ACL Doc 23349. https://asbestosclaims.law/library/23349.
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