Patent US5039293A successfully refreshed from Google Patents.
US5039293A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for the manufacture of a composite part
Assignee: Bayer AG
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Filing: 1988-06-06
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Granted: 1991-08-13
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Expires: 2008-06-06
Abstract
Abstract The present invention relates to a process and a device for the production of a composite part by the sequential introduction of several fillings (consisting of at least one free-flowing reaction mixture, of which at least one forms a foamed material) into the hollow space of the mold of a closed form tool. A mixing device is attached to form tool. The mixer comprises injector nozzles for the reaction components pointing into a mixing chamber and an ejector piston for the cleaning of the mixer chamber. The ejector piston may be slid forward right up to the outlet orifice of the mixing chamber.
Inventors
- 👤 Ulrich Knipp
- 👤 Otto Ganster
- 👤 Bernhard Rentz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 20:51
CPC Classifications
B; B29; B29C; B29C67/00; B29C67/24; B29C67/246; B29C31/00; B29C31/04; B29C31/10; B29C44/00; B29C44/02; B29C44/04; B29C44/0492; B29C44/08; B29C44/34; B29C44/36; B29C44/38; B29C44/42; B29C44/428; B29C44/58; B29C44/581; B29C2791/00; B29C2791/001
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
96 words
A device for the production of a composite part, said device comprising a mold having a hollow space, a mixing device attached to said mold, said mixing device comprising injection orifices opening into a mixing chamber, said mixing chamber having an outlet opening into said hollow space, and an ejector piston capable of closing said injection orifices and capable of cleaning said mixing chamber and filling said outlet, a displacing piston arranged opposite said outlet and capable of touching said ejector piston when said ejector piston fills said outlet and wherein said displacing piston is tapered.
Claim 2
Independent Claim
96 words
A device for the production of a composite part, said device comprising a mold having a hollow space, a mixing device attached to said mold, said mixing device comprising injection orifices opening into a mixing chamber, said mixing chamber having an outlet opening into said hollow space, and an ejector piston capable of closing said injection orifices and capable of cleaning said mixing chamber and filling said outlet, a displacing piston arranged opposite said outlet and capable of touching said ejector piston when said ejector piston fills said outlet and wherein said displacing piston is tapered.
Claim 3
Dependent Claim
20 words
The device of claim 1, wherein the tapering of the tapered surface is in the shape of a truncated cone.
Claim 4
Dependent Claim
19 words
The device of claim 1, wherein the tapering of the tapered surface is in the shape of a platform.
Claim 5
Dependent Claim
28 words
The device of claim 1, wherein the contour of the front surface of the displacing piston is smaller than that of the front surface of the ejector piston.
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) | 1994-08-12 | 1995-02-11 | 1995-08-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-08-12 | 1999-02-11 | 1999-08-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-08-12 | 2003-02-11 | 2003-08-13 | $7700.00 | Window Closed / Lapsed |