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Richard B. Steffens received US Patent No. 2,292,246 on August 4, 1942, filed August 29, 1938. It was assigned to Philip Carey Manufacturing Co.
The patent's description opens (from the scanned text):
This invention relates to an insulating duct and particularly one made of non-metal material, such as asbestos paper or the like, having elbows or bends in which duct turns or vanes are provided.
- Author
- Richard B. Steffens
- Published by
- US Patent Office
- Series
- US Patent No. 2,292,246
- Date
- August 4, 1942
- Library no.
- ACL Doc 22216 · asbestosclaims.law/library/22216
- Rights
- US government work, in the public domain.
Read or download
Read online Download the PDF PDF · 3 pages · 271 KB
Where it was listed
- Asbestos, September 1942, in its patents department (the year's issues)
Cite this document
Richard B. Steffens. “Duct Turn (US Patent 2,292,246, 1942).” August 4, 1942. US Patent No. 2,292,246. US Patent Office. AsbestosClaims.Law Library, ACL Doc 22216. https://asbestosclaims.law/library/22216.
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