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John S. Parkinson received US Patent No. 2,159,488 on May 23, 1939, filed August 1, 1935. It was assigned to Johns Manville.
The patent's description opens (from the scanned text):
This invention relates to an acoustical structure comprising an air-impermeable member and a thick facing element defining an air-filled space with the member and provided with openings freely communicating with and adapted to admit incident sound to the said space.
- Author
- John S. Parkinson
- Published by
- US Patent Office
- Series
- US Patent No. 2,159,488
- Date
- May 23, 1939
- Library no.
- ACL Doc 23304 · asbestosclaims.law/library/23304
- Rights
- US government work, in the public domain.
Read or download
Read online Download the PDF PDF · 4 pages · 435 KB
Where it was listed
- Asbestos, September 1939, in its patents department (the year's issues)
Cite this document
John S. Parkinson. “Perforated Membrane (US Patent 2,159,488, 1939).” May 23, 1939. US Patent No. 2,159,488. US Patent Office. AsbestosClaims.Law Library, ACL Doc 23304. https://asbestosclaims.law/library/23304.
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