Patent US4663381A successfully refreshed from Google Patents.
US4663381A
Expired / Lapsed
US
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Interior noise reduction in motor vehicles
Assignee: Dr Alois Stankiewicz GmbH
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Filing: 1984-11-27
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Granted: 1987-05-05
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Expires: 2004-11-27
Abstract
Abstract Viscoelastic plastics materials having a dynamic elasticity modulus of 107 to 1010 Nm-2 and a loss factor of at least 5 are used for the manufacture of motor vehicle parts, such as wheel housing parts, instrument panels, and door panels, in order to reduce interior noise.
Inventors
- 👤 Ehrenfried Blumel
- 👤 Heinemann Gahlau
- 👤 Manfred Hoffmann
- 👤 Klaus Wittenmayer
- 👤 Thomas Stankiewicz
- 👤 Christoph Kittel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 22:37
CPC Classifications
C; C08; C08L; C08L23/00; C08L23/02; C08L23/10; B; B60; B60K; B60K35/00; B60K35/20; B60K37/00; B60K37/20; B60R; B60R13/00; B60R13/08; B60R13/0861; B62; B62D; B62D25/00; B62D25/08; B62D25/16; B62D25/161; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/65; C08G18/66; C08G18/6666; C08G18/667; C08G18/6674; C08L23/16; C08L25/00; C08L25/02; C08L25/04
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
101 words
A wheel housing part for securing inside a wheel guard of a motor vehicle, said part being formed from a viscoelastic material comprised of a plastic, a rubber, and a filler, such that said viscoelastic material has a dynamic elasticity modulus of 10 7 to 10 10 Nm -2 and a loss factor of at least 0.05, wherein the viscoelastic material is formed from an intimate mixture from 25 to 40% by weight of an olefin polymer having high impact resistance; from 25 to 40% by weight of a synthetic rubber; and from 25 to 40% by weight of amorphous chalk.
Claim 2
Dependent Claim
101 words
A wheel housing part for securing inside a wheel guard of a motor vehicle, said part being formed from a viscoelastic material comprised of a plastic, a rubber, and a filler, such that said viscoelastic material has a dynamic elasticity modulus of 10 7 to 10 10 Nm -2 and a loss factor of at least 0.05, wherein the viscoelastic material is formed from an intimate mixture from 25 to 40% by weight of an olefin polymer having high impact resistance; from 25 to 40% by weight of a synthetic rubber; and from 25 to 40% by weight of amorphous chalk.
Claim 3
Dependent Claim
157 words
A wheel housing part for securing inside a wheel guard of a motor vehicle, said part being formed from a viscoelastic material comprised of a plastic, a rubber, and a filler, such that said viscoelastic material has a dynamic elasticity modulus of 10 7 to 10 10 Nm -2 and a loss factor of at least 0.05, wherein the viscoelastic material is formed from an intimate mixture of from 25 to 40% by weight of a polymer comprising said plastic and selected from the group consisting of olefin polymers having high impact resistance, styrene polymers having high impact resistance, and mixtures thereof; from 25 to 40% by weight of a synthetic rubber; and from 25 to 40% by weight of an amorphous filler, wherein the olefin polymer is polypropylene of high impact resistance, the synthetic rubber is an unsaturated ethylene-propylene-diene-rubber (EPDM), and the filler is selected from the group consisting of amorphous silicon dioxide and amorphous chalk.
Claim 4
Dependent Claim
157 words
A wheel housing part for securing inside a wheel guard of a motor vehicle, said part being formed from a viscoelastic material comprised of a plastic, a rubber, and a filler, such that said viscoelastic material has a dynamic elasticity modulus of 10 7 to 10 10 Nm -2 and a loss factor of at least 0.05, wherein the viscoelastic material is formed from an intimate mixture of from 25 to 40% by weight of a polymer comprising said plastic and selected from the group consisting of olefin polymers having high impact resistance, styrene polymers having high impact resistance, and mixtures thereof; from 25 to 40% by weight of a synthetic rubber; and from 25 to 40% by weight of an amorphous filler, wherein the olefin polymer is polypropylene of high impact resistance, the synthetic rubber is an unsaturated ethylene-propylene-diene-rubber (EPDM), and the filler is selected from the group consisting of amorphous silicon dioxide and amorphous chalk.
Claim 5
Dependent Claim
16 words
A wheel housing part according to claim 1, wherein said synthetic rubber is a styrene-butadiene-rubber (SBR).
Claim 6
Dependent Claim
27 words
A wheel housing part according to claim 2, wherein said styrene polymer is selected from the group consisting of polystyrene and styrene copolymers having high impact resistance.
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) | 1990-05-04 | 1990-11-03 | 1991-05-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-05-04 | 1994-11-03 | 1995-05-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-05-04 | 1998-11-03 | 1999-05-05 | $7700.00 | Window Closed / Lapsed |