US4242391A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Noise barrier pad and the method for the production of same
Assignee: Carl Freudenberg KG
•
Filing: 1978-06-13
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Granted: 1980-12-30
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Expires: 1998-06-13
Abstract
Abstract A noise barrier pad and a method for the production of same comprises the steps of forming a tread layer by reacting a mixture for polyurethane foam in a hollow mold having separable upper and lower parts and which is shaped so as to form the tread layer, curing the foam, removing the upper part of the mold, placing a blank of noise barrier material on the surface of the foam which corresponds to the bottom side of the tread layer, and forming a bottom foam layer on the tread layer and barrier material by placing another upper mold constructed in accordance with the bottom layer of the noise barrier pad and defining a cavity over the tread layer and barrier material and filling the cavity with the reaction mixture for the polyurethane foam.
Inventors
- 👤 Hans Reinhardt
- 👤 Manfred Schmahl
- 👤 Armin Tritsch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 22:26
CPC Classifications
B; B32; B32B; B32B7/00; B32B7/02; B32B5/00; B32B5/22; B32B5/32; B29; B29C; B29C44/00; B29C44/02; B29C44/08; B29C44/083; B29C44/086; B32B5/18; B32B5/20; B60; B60N; B60N3/00; B60N3/04; B60N3/048; B32B2266/00; B32B2266/02; B32B2266/0214; B32B2266/0278; B32B2307/00; B32B2307/10; B32B2307/102; B32B2471/00; B32B2471/04; B32B2605/00; B32B2605/003; Y; Y10; Y10T; Y10T428/00; Y10T428/23; Y10T428/239; Y10T428/24; Y10T428/24479; Y10T428/24496; Y10T428/24504; Y10T428/24512; Y10T428/249921; Y10T428/249953; Y10T428/249981; Y10T428/249987; Y10T428/24999
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
154 words
A process for producing a noise barrier pad for industrial vehicles, comprising forming a shaped tread layer by reacting a mixture for a polyurethane foam having a density of about 600-1100 kg/m 3 in a hollow mold having separable upper and lower parts and which is shaped so as to form the tread layer; removing the upper mold part; placing a blank of noise barrier material comprising a heavy spar layer on a portion of the bottom side of the tread layer; placing over the lower mold part a second upper mold part so as to define with the lower mold part, tread layer and spar layer a cavity; and filling the cavity with a reaction mixture to form therein a bottom layer of polyurethane foam having a density of about 150-600 kg/m 3 , the bottom layer in conjunction with the tread layer encapsulating the spar sheet and thereby fixing it in position.
Claim 2
Dependent Claim
154 words
A process for producing a noise barrier pad for industrial vehicles, comprising forming a shaped tread layer by reacting a mixture for a polyurethane foam having a density of about 600-1100 kg/m 3 in a hollow mold having separable upper and lower parts and which is shaped so as to form the tread layer; removing the upper mold part; placing a blank of noise barrier material comprising a heavy spar layer on a portion of the bottom side of the tread layer; placing over the lower mold part a second upper mold part so as to define with the lower mold part, tread layer and spar layer a cavity; and filling the cavity with a reaction mixture to form therein a bottom layer of polyurethane foam having a density of about 150-600 kg/m 3 , the bottom layer in conjunction with the tread layer encapsulating the spar sheet and thereby fixing it in position.
Claim 3
Dependent Claim
11 words
A noise barrier pad produced by the method of claim 1.
References Cited (Backward Citations)
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US2845997A
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US3534129A
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US3534828A
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US3762489A
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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) | 1983-12-30 | 1984-06-30 | 1984-12-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-12-30 | 1988-06-30 | 1988-12-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-12-30 | 1992-06-30 | 1992-12-30 | $7700.00 | Window Closed / Lapsed |