Patent US4190697A successfully refreshed from Google Patents.
US4190697A
Expired / Lapsed
US
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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 22:47
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.
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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) | 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 |