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Joseph Hawkridge, David Robertson and Charles Jesu Nairne received US Patent No. 1,443,221 on January 23, 1923, filed November 3, 1921.
The patent's description opens (from the scanned text):
The invention consists in improvements relating to fire-resisting coverings or laggings for preventing the passage of heat out of or into boilers or other vessels.
- Author
- Joseph Hawkridge; David Robertson; Charles Jesu Nairne
- Published by
- US Patent Office
- Series
- US Patent No. 1,443,221
- Date
- January 23, 1923
- Library no.
- ACL Doc 23236 · asbestosclaims.law/library/23236
- Rights
- US government work, in the public domain.
Read or download
Read online Download the PDF PDF · 4 pages · 326 KB
Where it was listed
- Asbestos, April 1923, in its patents department (the year's issues)
Cite this document
Joseph Hawkridge, David Robertson, Charles Jesu Nairne. “Non-conducting Covering for Boilers and other Vessels (US Patent 1,443,221, 1923).” January 23, 1923. US Patent No. 1,443,221. US Patent Office. AsbestosClaims.Law Library, ACL Doc 23236. https://asbestosclaims.law/library/23236.
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