Patent US3818522A successfully refreshed from Google Patents.
US3818522A
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Laminar cushion
Assignee: CALOTTAN AG
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Filing: 1973-04-12
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Granted: 1974-06-25
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Expires: 1993-04-12
Abstract
Abstract A cushion consisting of three layers of foam plastic or foam rubber separated by double layers of polyolefin foil. The layers of foam material are each formed with a multiplicity of passages extending in the direction of layer thickness, and the passages in each layer are aligned with respective passages in the other two layers. The polyolefin layers provide two integral, pressureresponsive valves in each passage, each valve being formed by a flap bounded in one foil layer by a crescent-shaped cut and normally superimposed on a portion of the other foil layer formed with an opening therein. The cushion breathes when subjected to varying compressive stresses.
Inventors
- 👤 W Schuster
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 23:52
CPC Classifications
B; B32; B32B; B32B5/00; B32B5/18; A; A47; A47C; A47C21/00; A47C21/04; A47C21/042; A47C21/046; A47C27/00; A47C27/14; A47C27/142; A47C27/144; A47C27/146; A47C27/15; B32B27/00; B32B27/06; B32B27/065; B32B27/08; B32B3/00; B32B3/26; B32B3/266; B32B5/22; B32B5/32; B32B7/00; B32B7/04; B32B7/12; B68; B68G; B68G11/00; B68G11/04; B32B2305/00; B32B2305/02; B32B2305/022; B32B2437/00; B32B2437/02; B32B2605/00; B32B2605/003; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24273; Y10T428/24322
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
166 words
A laminar cushion comprising: a. three layers of resilient, cellular material, 1. each layer having two major faces extending in the direction of length and width of said layer and separated from each other by the thickness of said layer, said thickness being substantially smaller that said length and width, 2. said layers being superposed in the direction of said thickness, thereby forming two pairs of contiguously juxtaposed layers, 3. each layer being formed with a plurality of passages extending therethrough in the direction of the thickness thereof and being aligned with corresponding respective passages in the other two layers; b. foil means interposed between the adjacent major faces of each of said pairs for separating said adjacent faces; and c. a plurality of valve means in each of said foil means respectively aligned with said aligned passages, said valve means being normally closed for separating the adjacent aligned passages and responding to a difference in fluid pressure in said adjacent passages for connecting the same.
Claim 2
Dependent Claim
166 words
A laminar cushion comprising: a. three layers of resilient, cellular material, 1. each layer having two major faces extending in the direction of length and width of said layer and separated from each other by the thickness of said layer, said thickness being substantially smaller that said length and width, 2. said layers being superposed in the direction of said thickness, thereby forming two pairs of contiguously juxtaposed layers, 3. each layer being formed with a plurality of passages extending therethrough in the direction of the thickness thereof and being aligned with corresponding respective passages in the other two layers; b. foil means interposed between the adjacent major faces of each of said pairs for separating said adjacent faces; and c. a plurality of valve means in each of said foil means respectively aligned with said aligned passages, said valve means being normally closed for separating the adjacent aligned passages and responding to a difference in fluid pressure in said adjacent passages for connecting the same.
Claim 3
Dependent Claim
18 words
said layers being superposed in the direction of said thickness, thereby forming two pairs of contiguously juxtaposed layers,
Claim 4
Dependent Claim
18 words
said layers being superposed in the direction of said thickness, thereby forming two pairs of contiguously juxtaposed layers,
Claim 5
Dependent Claim
37 words
A cushion as set forth in claim 1, wherein each of said foil means includes two directly superimposed foil members of flexible material, respective parts of the superimposed foil members jointly constituting each of said valve means.
Claim 6
Dependent Claim
69 words
A cushion as set forth in claim 2, wherein said part of one of said foil members is formed with an opening therethrough, and said part of the other foil member is formed with a cut bounding a flap portion of said other foil member superimposed on said opening in the normal closed condition of said valve means, and responding to said difference by flexing away from said opening.
Claim 7
Dependent Claim
96 words
each layer being formed with a plurality of passages extending therethrough in the direction of the thickness thereof and being aligned with corresponding respective passages in the other two layers; b. foil means interposed between the adjacent major faces of each of said pairs for separating said adjacent faces; and c. a plurality of valve means in each of said foil means respectively aligned with said aligned passages, said valve means being normally closed for separating the adjacent aligned passages and responding to a difference in fluid pressure in said adjacent passages for connecting the same.
Claim 8
Dependent Claim
96 words
each layer being formed with a plurality of passages extending therethrough in the direction of the thickness thereof and being aligned with corresponding respective passages in the other two layers; b. foil means interposed between the adjacent major faces of each of said pairs for separating said adjacent faces; and c. a plurality of valve means in each of said foil means respectively aligned with said aligned passages, said valve means being normally closed for separating the adjacent aligned passages and responding to a difference in fluid pressure in said adjacent passages for connecting the same.
Claim 9
Dependent Claim
13 words
A cushion as set forth in claim 3, wherein said cut is crescent-shaped.
Claim 10
Dependent Claim
19 words
A cushion as set forth in claim 3, wherein said two foil members are fixedly fastened to each other.
Claim 11
Dependent Claim
46 words
A cushion as set forth in claim 1, wherein each of said valve means includes a check valve permitting flow of air through the aligned passages in one direction only, the two check valves in each set of aligned passages permitting flow in the same direction.
Claim 12
Dependent Claim
43 words
A cushion as set forth in claim 6, wherein said three layers incluDe a core layer interposed between the two other layers, said core layer having respective face portions bounding the passage through said core layer, said face portions being impervious to air.
Claim 13
Dependent Claim
21 words
A cushion as set forth in claim 7, wherein said foil means are impervious to air, and said material is elastomeric.
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) | 1977-06-24 | 1977-12-24 | 1978-06-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-24 | 1981-12-24 | 1982-06-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-24 | 1985-12-24 | 1986-06-25 | $7700.00 | Window Closed / Lapsed |