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Harry W. Porter and Jr William C. Boren received US Patent No. 1,987,517 on January 8, 1935, filed July 8, 1933.
The patent's description opens (from the scanned text):
This invention relates in'general to conduits and more particularly to underground'conduits for housing, protecting and insulating pipes which are used for example, for conductingsteani fromi a' central heating plant to different build ings'to be heated.
- Author
- Harry W. Porter; Jr William C. Boren
- Published by
- US Patent Office
- Series
- US Patent No. 1,987,517
- Date
- January 8, 1935
- Library no.
- ACL Doc 22140 · asbestosclaims.law/library/22140
- Rights
- US government work, in the public domain.
Read or download
Read online Download the PDF PDF · 8 pages · 858 KB
Where it was listed
- Asbestos, January 1935, in its patents department (the year's issues)
- Asbestos, April 1935, in its patents department (the year's issues)
Cite this document
Harry W. Porter, Jr William C. Boren. “Conduit system for insulation of underground steam pipes (Therm-O-Tile) (US Patent 1,987,517, 1935).” January 8, 1935. US Patent No. 1,987,517. US Patent Office. AsbestosClaims.Law Library, ACL Doc 22140. https://asbestosclaims.law/library/22140.
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