Patent US4472340A successfully refreshed from Google Patents.
US4472340A
Expired / Lapsed
US
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Method for producing tire-shaped articles from polyurethane multi-component reaction materials
Assignee: Bayer AG
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Filing: 1980-09-02
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Granted: 1984-09-18
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Expires: 2000-09-02
Abstract
Abstract The instant invention is directed to a method for producing hollow articles which are open toward the axis, are rotationally symmetrical and symmetrical with respect to a central plane produced from polyurethane multi-component reaction materials by the reaction casting method, a mold core being required during production for generating the cavity in the article, and the reaction mixture being supplied from the rotational axis via feed channels to a mold cavity, comprising: supplying a reaction mixture alternately to each side of the mold cavity, the article thus being built up symmetrically with respect to the rotational axis.
Inventors
- 👤 Heinrich Boden
- 👤 Gerhard Just
- 👤 Bernhard Rentz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 09:14
CPC Classifications
B; B29; B29D; B29D30/00; B29D30/06; B29D30/0679; B29C; B29C31/00; B29C31/04; B29C33/00; B29C33/0061; B29C33/0072; B29C39/00; B29C39/02; B29C39/04; B29C39/08; B29C41/00; B29C41/02; B29C41/04; B29C41/042; B29C41/047; B29C44/00; B29C44/34; B29C44/36; B29C44/38; B29C44/383; B29C67/00; B29C67/24; B29C67/246; B29L; B29L2030/00
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
91 words
A method for producing hollow articles which are open toward the axis, are rotationally symmetrical and symmetrical with respect to a central plane produced from polyurethane multi-component reaction materials by the reaction casting method, a mold core being required during production for generating the cavity in the article, and the reaction mixture being supplied from the rotational axis via feed channels to a mold cavity, comprising: supplying a reaction mixture alternately to each side of the mold cavity, the article thus being built up symmetrically with respect to the rotational axis.
Claim 2
Independent Claim
91 words
A method for producing hollow articles which are open toward the axis, are rotationally symmetrical and symmetrical with respect to a central plane produced from polyurethane multi-component reaction materials by the reaction casting method, a mold core being required during production for generating the cavity in the article, and the reaction mixture being supplied from the rotational axis via feed channels to a mold cavity, comprising: supplying a reaction mixture alternately to each side of the mold cavity, the article thus being built up symmetrically with respect to the rotational axis.
Claim 3
Dependent Claim
23 words
The method of claim 1, wherein said reaction mixture composition is changed at least once while the hollow article is being built up.
Claim 4
Dependent Claim
30 words
The method of claim 1, wherein said multicomponent reaction mixture is premixed in a self-cleaning injection mixer and is subsequently mixed in a mixer arranged upstream of the feed channels.
Claim 5
Dependent Claim
33 words
The method of claim 1, wherein said reaction mixture is supplied through an axial to-and-fro movement of the casting apparatus lying in the rotational axis, determined by the rotational speed of the mold.
Claim 6
Dependent Claim
30 words
The method of claim 1, wherein said reaction mixture is supplied through a guide system on the core, which in the case of a casting apparatus, does not move axially.
References Cited (Backward Citations)
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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) | 1987-09-18 | 1988-03-19 | 1988-09-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-09-18 | 1992-03-19 | 1992-09-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-09-18 | 1996-03-19 | 1996-09-18 | $7700.00 | Window Closed / Lapsed |