USRE32780E
Expired / Lapsed
US
⏱️ 0.0 years remaining
Core material for an automobile bumper
Assignee: JSP Corp
•
Filing: 1987-09-17
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Granted: 1988-11-08
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Expires: 2007-09-17
Abstract
Abstract For use in an automobile bumper, a core material composed of a molded article of prefoamed polyolefin resin particles. The core material has a density of 0.05 to 0.15 g/cm 3 and the relation represented by the following expression E.sub.20/ρ ≧20 kg-cm/g wherein E 20 is the amount of energy absorption (kg-cm/cm 3 ) when the core material is compressed to 50% at 20° C., and ρ is the density (g/cm 3 ) of the core material.
Inventors
- 👤 Shohei Yoshimura
- 👤 Akira Adachi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 07:30
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/22; C08J9/228; C08J9/232; B; B60; B60R; B60R19/00; B60R19/02; B60R19/03; C08J9/16; C08J9/18; C08J2323/00; C08J2323/02; Y; Y10; Y10T; Y10T428/00; Y10T428/23; Y10T428/233; Y10T428/239; Y10T428/249921; Y10T428/249953
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
122 words
A core material for use in automobile bumpers, said core material being composed of a molded article of prefoamed particles of a polyolefin resin, and having a density of 0.05 to 0.15 kg-g/cm 3 and the relation represented by the following expression E.sub.20 /ρ≧20 kg-cm/g wherein E 20 is the amount of energy absorption (kg-cm/cm 3 ) when the core material is compressed to 50% at 20° C., and ρ is the density (g/cm 3 ) of the core material. wherein said particles are nearly spherical in shape, have a particle diameter of 2 to 15 mm, a cell diameter of 0.10 to 2.00 mm and a proportion of closed cells of at least 90% and contain air filled within the cells.
Claim 2
Dependent Claim
122 words
A core material for use in automobile bumpers, said core material being composed of a molded article of prefoamed particles of a polyolefin resin, and having a density of 0.05 to 0.15 kg-g/cm 3 and the relation represented by the following expression E.sub.20 /ρ≧20 kg-cm/g wherein E 20 is the amount of energy absorption (kg-cm/cm 3 ) when the core material is compressed to 50% at 20° C., and ρ is the density (g/cm 3 ) of the core material. wherein said particles are nearly spherical in shape, have a particle diameter of 2 to 15 mm, a cell diameter of 0.10 to 2.00 mm and a proportion of closed cells of at least 90% and contain air filled within the cells.
Claim 3
Dependent Claim
28 words
The core material of claim 1 which has a density of 0.06 to 0.13 g/cm 3 and the relation represented by the following expression E 20 /ρ≧22 kg-cm/g.
Claim 4
Dependent Claim
133 words
In an automobile bumper which is composed of a core material and a surface covering material, the improvement wherein said core material is composed of a molded article of prefoamed particles of a polyolefin resin, and having a density of 0.05 to 0.15 g/cm 3 and the relation represented by the following expression E.sub.20 /ρ≧20 kg-cm/g wherein E 20 is the amount of energy absorption (kg-cm/cm 3 ) when the core material is compressed to 50% at 20° C., and ρ is the density (g/cm 3 ) of the core material, wherein said particles are nearly spherical in shape, have a particle diameter of 2 to 15 mm, a cell diameter of 0.10 to 2.00 mm and a proportion of closed cells of at least 90% and contain air filled within the cells.
Claim 5
Dependent Claim
133 words
In an automobile bumper which is composed of a core material and a surface covering material, the improvement wherein said core material is composed of a molded article of prefoamed particles of a polyolefin resin, and having a density of 0.05 to 0.15 g/cm 3 and the relation represented by the following expression E.sub.20 /ρ≧20 kg-cm/g wherein E 20 is the amount of energy absorption (kg-cm/cm 3 ) when the core material is compressed to 50% at 20° C., and ρ is the density (g/cm 3 ) of the core material, wherein said particles are nearly spherical in shape, have a particle diameter of 2 to 15 mm, a cell diameter of 0.10 to 2.00 mm and a proportion of closed cells of at least 90% and contain air filled within the cells.
Claim 6
Dependent Claim
30 words
The automobile bumper of claim 3 wherein the core material has a density of 0.06 to 0.13 kg-g/cm 3 and the relation represented by the following expression E.sub.20 /ρ≧22 kg-cm/g.
Claim 7
Dependent Claim
17 words
The automobile bumper of claim 3 which has a bumper height of from 50 to 100 millimeters.
Claim 8
Dependent Claim
24 words
The automobile bumper of claim 3 wherein the polyolefin resin is selected from the group consisting of polypropylene, ethylene/propylene random copolymer and high-density polyethylene.
Claim 9
Dependent Claim
15 words
The automobile bumper of claim 3 wherein the polyolefin resin is an ethylene/propylene random copolymer.
Claim 10
Dependent Claim
14 words
The automobile bumper of claim 3 wherein the polyolefin resin is high-density polyethylene. .Iadd.
Claim 11
Dependent Claim
104 words
The core material of claim 1, wherein the polyolefin resin is not cross linked. .Iaddend. .Iadd.10. The core material of claim 1, wherein the polyolefin resin is cross linked. .Iaddend. .Iadd.11. The automobile bumper of claim 3 wherein the core material is composed of a polyolefin resin that is not cross linked. .Iaddend. .Iadd.12. The automobile bumper of claim 3 wherein the core material is composed of a polyolefin resin that is cross linked. .Iaddend. .Iadd.13. The automobile bumper of claim 7 wherein said copolymer is not cross linked. .Iaddend. .Iadd.14. The automobile bumper of claim 7 wherein said copolymer is cross linked. .Iaddend.
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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) | 1991-11-08 | 1992-05-09 | 1992-11-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-11-08 | 1996-05-09 | 1996-11-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-11-08 | 2000-05-09 | 2000-11-08 | $7700.00 | Window Closed / Lapsed |