US4190697A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multidensity foam article and method of preparation
Assignee: Jason Inc
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Filing: 1979-01-15
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Granted: 1980-02-26
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Expires: 1999-01-15
Abstract
Abstract A multidensity polyurethane foam article suitable for use as a seat cushion includes a supportive layer of firm foam and a comfortable layer of softer foam. The multidensity article has a sag factor of about 3.0 to about 4.5, and the two foam layers are bonded together without employing adhesives. The multidensity foam article is prepared by placing a first formulation capable of yielding a firm foam into a mold and permitting said formulation to start creaming, rising and foaming; introducing a second liquid formulation capable of forming a soft foam into the mold after the first formulation has completed 10 to 80% of its potential rise so that the second formulation passes through the rising first formulation and the first formulation floats upon the second formulation; and then permitting the two formulations to cream, foam, rise and cure into a single multidensity article having a firm supportive foam layer and a soft foam layer, which layers are bonded and knitted together at their common boundary during the curing process.
Inventors
- 👤 John R. Ahrens
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 16:52
CPC Classifications
B; B29; B29C; B29C44/00; B29C44/02; B29C44/04; B29C44/0461; B32; B32B; B32B5/00; B32B5/14; B29C44/0476; B29C44/0492; B32B5/18; B32B5/20; B32B7/00; B32B7/04; B29K; B29K2075/00; B29L; B29L2031/00; B29L2031/58; B29L2031/751; B32B38/00; B32B2038/0052; B32B2038/0076; B32B2266/00; B32B2266/02; B32B2266/0214; B32B2266/0278; B32B2305/00; B32B2305/72; B32B2605/00; Y; Y10; Y10S; Y10S297/00; Y10S297/01; Y10T; Y10T428/00; Y10T428/24; Y10T428/24942; Y10T428/24983; Y10T428/24992; Y10T428/249921; Y10T428/249953; Y10T428/24996; Y10T428/249981
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
141 words
A method of preparing a multidensity foam article suitable for use as a vehicle cushion comprises: (a) partially filling a mold with a first formulation which will yield a firm foam; (b) permitting the first formulation to cream, foam and rise to about 10% to about 80% of its potential; (c) adding to the mold a second formulation which will yield a soft foam, said second formulation being liquid and having a higher specific gravity than the foaming first formulation so that the second formulation passes through the first formulation and the first formulation floats upon the second formulation; and (d) allowing both formulations to cream, foam, rise and cure to obtain a single multidensity foam article having a firm, foam layer and a soft foam layer which are bonded and knitted together at their common boundary during the curing process.
Claim 2
Independent Claim
141 words
A method of preparing a multidensity foam article suitable for use as a vehicle cushion comprises: (a) partially filling a mold with a first formulation which will yield a firm foam; (b) permitting the first formulation to cream, foam and rise to about 10% to about 80% of its potential; (c) adding to the mold a second formulation which will yield a soft foam, said second formulation being liquid and having a higher specific gravity than the foaming first formulation so that the second formulation passes through the first formulation and the first formulation floats upon the second formulation; and (d) allowing both formulations to cream, foam, rise and cure to obtain a single multidensity foam article having a firm, foam layer and a soft foam layer which are bonded and knitted together at their common boundary during the curing process.
Claim 3
Dependent Claim
15 words
A process according to claim 1, wherein said firm and soft foams are polyurethane foams.
Claim 4
Dependent Claim
22 words
A process according to claim 1, wherein the multidensity foamed article has a sag factor ranging from about 3.0 to about 4.5.
Claim 5
Dependent Claim
19 words
A process according to claim 1, wherein the firm foam has an I.L.D. of about 70 to about 140.
Claim 6
Dependent Claim
19 words
A process according to claim 1, wherein the soft foam has an I.L.D. of about 15 to about 50.
Claim 7
Dependent Claim
43 words
A multidensity foam article suitable for use as a vehicle cushion which includes a firm polyurethane foam layer and a soft polyurethane foam layer, said firm and soft layers being bonded and knitted together along their common boundary without the use of adhesives.
Claim 8
Dependent Claim
43 words
A multidensity foam article suitable for use as a vehicle cushion which includes a firm polyurethane foam layer and a soft polyurethane foam layer, said firm and soft layers being bonded and knitted together along their common boundary without the use of adhesives.
Claim 9
Dependent Claim
16 words
A foam article of claim 6 which has a sag factor of 3.0 to about 4.5.
Claim 10
Dependent Claim
16 words
A foam article of claim 6 in which the firm layer is of crosslinked polyurethane foam.
Claim 11
Dependent Claim
20 words
A foam article of claim 6 in which the soft foam layer covers the top and sides of the article.
Claim 12
Dependent Claim
49 words
A multidensity foam article made by the method of claim 1 and suitable for use as a vehicle cushion which includes a firm foam layer and a soft foam layer, said firm and soft layers being bonded and knitted together along their common boundary without the use of adhesive.
References Cited (Backward Citations)
US3345245A
Cited
US3264382A
Cited
US3419455A
Cited
US3429085A
Cited
US3607593A
Cited
US3709966A
Cited
US3929948A
Cited
US3833259A
Cited
US4032608A
Cited
US4086675A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-02-25 | 1983-08-27 | 1984-02-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-02-25 | 1987-08-27 | 1988-02-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-02-25 | 1991-08-27 | 1992-02-26 | $7700.00 | Window Closed / Lapsed |