US3607601A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Foamed shock-absorbent structure
Assignee: Phillips Petroleum Co
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Filing: 1968-08-05
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Granted: 1971-09-21
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Expires: 1988-08-05
Abstract
Abstract A shock-absorbent structure comprises a first foamed layer of a normally solid synthetic thermoplastic polymeric material, for example polyethylene, having a compressive strength at 10 percent deflection in the range of about 30 to about 200, and a second underlying layer of a flexible cellular rubber, for example flexible polyurethane.
Inventors
- 👤 Paul B Milam Jr
- 👤 Nolan J Edmunds
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 17:02
CPC Classifications
B; B32; B32B; B32B25/00; B32B25/04; B32B25/045; A; A63; A63B; A63B71/00; A63B71/08; B32B27/00; B32B5/00; B32B5/18; B32B7/00; B32B7/04; B32B7/12; B32B2266/00; B32B2266/02; B32B2266/0214; B32B2266/025; B32B2305/00; B32B2305/02; B32B2307/00; B32B2307/50; B32B2307/56; B32B2307/70; B32B2307/72; Y; Y10; Y10T; Y10T428/00; Y10T428/249921; Y10T428/249953; Y10T428/249981; Y10T428/31504; Y10T428/31855; Y10T428/31938
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
34 words
A structure in accordance with claim 1 wherein said synthetic thermoplastic polymeric material is selected from the group consisting of homopolymers of ethylene and copolymers of ethylene with at least one monomer copolymerizable therewith.
Claim 2
Dependent Claim
27 words
A structure in accordance with claim 2 wherein said first foamed layer has a density in the range of about 0.25 to about 0.7 gram per cc.
Claim 3
Dependent Claim
29 words
A structure in accordance with claim 3 wherein said synthetic thermoplastic polymeric material has an unfoamed density in the range of about 0.910 to about 0.930 gram per cc.
Claim 4
Dependent Claim
34 words
A structure in accordance with claim 1 wherein said first foamed layer has a compressive strength at 10 percent deflection (ASTM D1621-64T, Procedure A) in the range of about 35 to about 150 p.s.i.
Claim 5
Dependent Claim
34 words
A structure in accordance with claim 1 wherein said first foamed layer has a compressive strength at 10 percent deflection (ASTM D1621-64T, Procedure A) in the range of about 45 to about 100 p.s.i.
Claim 6
Dependent Claim
27 words
A structure in accordance with claim 6 wherein said first foamed layer has a density in the range of about 0.3 to about 0.5 gram per cc.
Claim 7
Dependent Claim
34 words
A structure in accordance with claim 7 wherein said synthetic thermoplastic polymeric material is selected from the group consisting of homopolymers of ethylene and copolymerS of ethylene with at least one monomer copolymerizable therewith.
Claim 8
Dependent Claim
29 words
A structure in accordance with claim 8 wherein said synthetic thermoplastic polymeric material has an unfoamed density in the range of about 0.910 to about 0.930 gram per cc.
Claim 9
Dependent Claim
21 words
A structure in accordance with claim 9 wherein said synthetic thermoplastic polymeric material is polyethylene and wherein said rubber is polyurethane.
Claim 10
Dependent Claim
18 words
A structure in accordance with claim 1 wherein said first layer is bonded to said second, underlying layer.
Claim 11
Dependent Claim
19 words
A structure in accordance with claim 1 wherein said first layer is mechanically fastened to said second, underlying layer.
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) | 1974-09-20 | 1975-03-22 | 1975-09-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-20 | 1979-03-22 | 1979-09-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-20 | 1983-03-22 | 1983-09-21 | $7700.00 | Window Closed / Lapsed |