Patent US2968327A successfully refreshed from Google Patents.
US2968327A
Expired / Lapsed
US
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Method of improving the sound absorption efficiency of perforated porous acoustical materials
Assignee: Armstrong World Industries Inc
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Filing: 1957-06-18
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Granted: 1961-01-17
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Expires: 1977-06-18
Abstract
No abstract record available.
Inventors
- 👤 Mariner Thomas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 12:00
CPC Classifications
E; E04; E04B; E04B1/00; E04B1/62; E04B1/74; E04B1/82; E04B1/84; E04B1/86; E04B2001/8245; Y; Y10; Y10T; Y10T408/00; Y10T408/03; Y10T83/00; Y10T83/929; Y10T83/9411; Y10T83/9423; Y10T83/9428
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
56 words
A METHOD OF IMPROVING THE SOUND ABSORPTION EFFICIENCY OF A PERFORATED FIBROUS ACOUSTICAL MATERIAL COMPRISING MECHANICALLY DELAMINATING THE FIBROUS STRUCTURE OF SAID MATERIAL IN AREAS BEING THE PERFORATION TO PROVIDE OPENINGS EXTENDING LATERALLY FROM THE PERFORATIONS FOR AIR FLOW TO REDUCE THE AIR FLOW RESISTANCE OF THE MATERIAL SIGNIFICANTLY AND THEREBY ENHANCE ITS SOUND ABSORPTION EFFICIENCY.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-01-17 | 1964-07-18 | 1965-01-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-01-17 | 1968-07-18 | 1969-01-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-01-17 | 1972-07-18 | 1973-01-17 | $7700.00 | Window Closed / Lapsed |