US3837426A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sound absorbing structural block
Assignee: Individual
•
Filing: 1974-01-04
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Granted: 1974-09-24
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Expires: 1994-01-04
Abstract
Abstract A sound absorbing block of molded structural material has a cavity that communicates with a region containing the sound to be suppressed through an elongated slot whose width decreases between the cavity and a section of constant width adjacent to the exterior surface of the block. Sound energy is dissipated by the air turbulence in the slot, particularly at the narrowest section, and within the cavity by multiple reflections. The inwardly flared structure of the slot achieves a significant increase in absorption in the mid to high frequency range as compared to conventional constant-width apertures having the same width, while being easier to manufacture and having fewer molding rejects than slots having an outwardly flared configuration.
Inventors
- 👤 K Kleinschmidt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 09:58
CPC Classifications
E; E04; E04B; E04B1/00; E04B1/62; E04B1/74; E04B1/82; E04B1/84; E04B1/8404; E04B2001/8457; E04B2001/8476; E04B2001/848; E04B2001/8485; E04B2001/849
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
94 words
Means for absorbing sound energy in a block of molded structural material having a cavity, one wall of said block having an exterior surface facing a source of said sound energy, comprising at least one elongated slot in said wall extending in length for a distance substantially coextensive with the depth of said cavity, said slot extending in depth from said exterior surface to said cavity, said slot having a variable width increasing from said exterior surface to said cavity except for a section adjacent to said exterior surface having a substantially constant width.
Claim 2
Dependent Claim
94 words
Means for absorbing sound energy in a block of molded structural material having a cavity, one wall of said block having an exterior surface facing a source of said sound energy, comprising at least one elongated slot in said wall extending in length for a distance substantially coextensive with the depth of said cavity, said slot extending in depth from said exterior surface to said cavity, said slot having a variable width increasing from said exterior surface to said cavity except for a section adjacent to said exterior surface having a substantially constant width.
Claim 3
Dependent Claim
30 words
Sound absorbing means according to claim 1 wherein Said increasing width is a linear function of the distance from the interior edge of said constant width section to said cavity.
Claim 4
Dependent Claim
36 words
Sound absorbing means according to claim 2 further characterized by at least one side of said slot having a tapered section forming an angle of 25* to 30+ with a vertical plane perpendicular to said wall.
Claim 5
Dependent Claim
121 words
A sound absorptive block of molded structural material having a cavity, a pair of opposite closed walls, third and fourth contiguous closed outer walls each contiguous with each of the end walls, a side having an opening opposite the third wall and extending to the cavity, and a fifth outer wall opposite the fourth wall, having an exposed surface facing the direction of noise to be absorbed and having a slot therein leading to the cavity, said slot being elongated and extending a distance substantially coextensive with the depth of said cavity, and said slot having a variable width increasing from said exterior surface to said cavity except for a section adjacent to said exterior surface having a substantially constant width.
Claim 6
Dependent Claim
121 words
A sound absorptive block of molded structural material having a cavity, a pair of opposite closed walls, third and fourth contiguous closed outer walls each contiguous with each of the end walls, a side having an opening opposite the third wall and extending to the cavity, and a fifth outer wall opposite the fourth wall, having an exposed surface facing the direction of noise to be absorbed and having a slot therein leading to the cavity, said slot being elongated and extending a distance substantially coextensive with the depth of said cavity, and said slot having a variable width increasing from said exterior surface to said cavity except for a section adjacent to said exterior surface having a substantially constant width.
Claim 7
Dependent Claim
31 words
A sound absorptive block according to claim 4 wherein said increasing width is a linear function of the distance from the interior edge of said constant width section to said cavity.
Claim 8
Dependent Claim
50 words
A sound absorptive block according to claim 5 further characterized by a first side of said slot being substantially flat and perpendicular to said fifth wall and a second side opposite said first side and having a tapered section forming an angle of 25* to 30* with said first side.
Claim 9
Dependent Claim
25 words
A sound absorptive block according to claim 5 wherein said first side has a tapered section that mirrors said tapered section of said second side.
Claim 10
Dependent Claim
28 words
A sound absorptive structural block according to claim 4 further characterized by at least one additional cavity, said additional cavity having at least one said variable width slot.
Claim 11
Dependent Claim
40 words
A sound absorptive block according to claim 5 wherein said slot width at said exposed surface is in the range of one quarter to one inch and said constant width section has a depth of at least one quarter inch.
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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) | 1977-09-23 | 1978-03-25 | 1978-09-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-23 | 1982-03-25 | 1982-09-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-23 | 1986-03-25 | 1986-09-24 | $7700.00 | Window Closed / Lapsed |