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John L. Ayer received US Patent No. 2,790,253 on April 30, 1957, filed July 30, 1953.
The patent's description opens (from the scanned text):
This invention relates to a demonstration device and, more particularly, to a demonstration device for demonstrating the efliciency of filter materials.
- Author
- John L. Ayer
- Published by
- US Patent Office
- Series
- US Patent No. 2,790,253
- Date
- April 30, 1957
- Library no.
- ACL Doc 22293 · asbestosclaims.law/library/22293
- Rights
- US government work, in the public domain.
Read or download
Read online Download the PDF PDF · 3 pages · 178 KB
Where it was listed
- Asbestos, June 1957, in its patents department (the year's issues)
Cite this document
John L. Ayer. “Filter demonstration device (US Patent 2,790,253, 1957).” April 30, 1957. US Patent No. 2,790,253. US Patent Office. AsbestosClaims.Law Library, ACL Doc 22293. https://asbestosclaims.law/library/22293.
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