US4304872A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flexible polyurethane foams having substantial number of cells with internal residual cell surface of 60 to 90 percent
Assignee: BP Chemicals Ltd
•
Filing: 1980-04-24
•
Granted: 1981-12-08
•
Expires: 2000-04-24
Abstract
Abstract A novel flexible polyurethane foam has a substantial number of cells with an internal residual cell surface greater than 60% and less than 90%. The novel foams have improved vibration damping characteristics.
Inventors
- 👤 Rudolf J. Tenhagen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 12:55
CPC Classifications
C; C08; C08J; C08J9/00; C08J2375/00; C08J2375/04; Y; Y10; Y10S; Y10S264/00; Y10S264/13; Y10S521/00; Y10S521/904; Y10S521/918
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
25 words
A flexible polyurethane foam which has at least 50% of the cells with an internal residual cell surface greater than 60% and less than 90%.
Claim 2
Dependent Claim
25 words
A flexible polyurethane foam which has at least 50% of the cells with an internal residual cell surface greater than 60% and less than 90%.
Claim 3
Dependent Claim
26 words
A flexible polyurethane foam according to claim 1 wherein substantially all the cells have an internal residual cell surface greater than 60% and less than 90%.
Claim 4
Dependent Claim
28 words
A flexible polyurethane foam according to claim 1 wherein at least 50% of the cells have an internal residual cell surface greater than 70% and less than 90%.
Claim 5
Dependent Claim
17 words
A flexible polyurethane foam according to claim 1 wherein the breathability is not more than 2 SCFM.
Claim 6
Dependent Claim
23 words
A flexible polyurethane foam according to claim 4 wherein the surface breathability measured by the Gurley test is not less than 2 seconds.
Claim 7
Dependent Claim
18 words
A flexible polyurethane foam according to claim 5 wherein the surface breathability is not more than 20 seconds.
Claim 8
Dependent Claim
23 words
A flexible polyurethane foam according to claim 6 wherein the hardness as measured by the IFD ASTM test is at least 100 N.
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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) | 1984-12-07 | 1985-06-08 | 1985-12-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-12-07 | 1989-06-08 | 1989-12-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-12-07 | 1993-06-08 | 1993-12-08 | $7700.00 | Window Closed / Lapsed |