US3905443A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Walls with resonant cavities
Assignee: Individual
•
Filing: 1973-11-01
•
Granted: 1975-09-16
•
Expires: 1993-11-01
Abstract
Abstract Sound absorbing members having resonant cavities of different frequency absorption character are made by forcing a structure having open-ended parallel honeycomb cavities through one or more sheets of plastic foam so that foam plugs fill a portion of each cavity; selected foam plugs are removed in order to obtain cavities of different depths and different frequency absorption character, and a closure plate is guided to one side and a porous plate is glued to the other side of the structure.
Inventors
- 👤 Jean Louis Sieuzac
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 20:08
CPC Classifications
B; B32; B32B; B32B3/00; B32B3/10; B32B3/12; B32B3/02; B32B3/08; B32B3/085; B32B5/00; B32B5/18; B32B5/22; E; E04; E04B; E04B1/00; E04B1/62; E04B1/74; E04B1/82; E04B1/84; E04B1/86; E04C; E04C2/00; E04C2/30; E04C2/34; E04C2/36; E04C2/365; B32B2266/00; B32B2266/02; B32B2266/0214; B32B2305/00; B32B2305/02; B32B2305/022; B32B2305/024; B32B2307/00; B32B2307/10; B32B2607/00; E04B2001/742; E04B2001/748
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
106 words
A method of making a sound absorbing wall having resonant cavities of different depths and different frequency absorption characteristics extending with parallel transverse axes, said method comprising the steps of providing a structure having honeycomb cavities with parallel axes, forcing said structure through a sheet of cured plastic foam which provides a foam plug filling an identical portion of each cavity, selectively removing the foam plugs from desired ones of said cavities in order to obtain cavities of different depths and different frequency absorption characteristics, gluing a closure plate to one side of said structure and gluing a porous plate to other side of said structure.
Claim 2
Independent Claim
106 words
A method of making a sound absorbing wall having resonant cavities of different depths and different frequency absorption characteristics extending with parallel transverse axes, said method comprising the steps of providing a structure having honeycomb cavities with parallel axes, forcing said structure through a sheet of cured plastic foam which provides a foam plug filling an identical portion of each cavity, selectively removing the foam plugs from desired ones of said cavities in order to obtain cavities of different depths and different frequency absorption characteristics, gluing a closure plate to one side of said structure and gluing a porous plate to other side of said structure.
Claim 3
Dependent Claim
65 words
The method of claim 1 additionally including the step of forcing said structure through a second sheet of plastic foam subsequent to the forcing of said structure through the first sheet of plastic foam to provide a second group of plugs in said cavities and removing selected ones of said plugs of said second group prior to the gluing of said plates to said structure.
Claim 4
Dependent Claim
23 words
The method of claim 1 including the additional step of coating the interiors of said cavities and the plugs therein with adhesive resin.
Claim 5
Dependent Claim
23 words
The method of claim 2 including the additional step of coating the interiors of said cavities and the plugs therein with adhesive resin.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-09-15 | 1979-03-17 | 1979-09-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-15 | 1983-03-17 | 1983-09-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-15 | 1987-03-17 | 1987-09-16 | $7700.00 | Window Closed / Lapsed |