Patent US4690862A successfully refreshed from Google Patents.
US4690862A
Expired / Lapsed
US
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Integral composite profile of cellular and non-cellular resins and a dual extrusion method for its manufacture
Assignee: Gossen Corp
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Filing: 1984-12-28
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Granted: 1987-09-01
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Expires: 2004-12-28
Abstract
Abstract The dual extrusion and fusion of cellular and non-cellular resin extrudates produces an integral composite profile having a tongue and groove interlock. The resins are extruded through a common die having overlapping orifices. A bulbous tongue of one extrudate is encapsulated by finger-like projections of a second extrudate and the mated profiles are pulled through a vacuumized sizing box adapted to sealingly receive the cellular portion and to freely receive the non-cellular portion.
Inventors
- 👤 Daniel J. Hoffmann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 17:02
CPC Classifications
B; B29; B29C; B29C44/00; B29C44/20; B29C44/22; B29C44/34; B29C44/36; B29C44/46; B29C44/50; B29C48/00; B29C48/03; B29C48/12; B29C48/16; B29C48/18; B29C48/22; B29C48/07; B29C48/08; B29L; B29L2031/00; B29L2031/26; Y; Y10; Y10T; Y10T428/00; Y10T428/249921; Y10T428/249953; Y10T428/249987; Y10T428/249988; Y10T428/249991; Y10T428/249992
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
43 words
An integral composite profile of a cellular thermoplastic resin and a non-cellular thermoplastic resin in which a first profile has a tongue and a second profile has a pair of fingers which encapsulate and are fused to the tongue of the first profile.
Claim 2
Dependent Claim
43 words
An integral composite profile of a cellular thermoplastic resin and a non-cellular thermoplastic resin in which a first profile has a tongue and a second profile has a pair of fingers which encapsulate and are fused to the tongue of the first profile.
Claim 3
Independent Claim
143 words
A method of dual extrusion for forming a cellular resin and a non-cellular resin into a unitary composite profile, said method comprising: extruding the cellular and non-cellular resins through separate extruders, through a common cross-head and a die having orifices whose profiles overlap to form overlapping extrudates; encapsulating an overlapped extrudate in an overlapping extrudate by pulling the extrudates through an expansion zone to impose a longitudinal tension on the extrudates while the cellular extrudate expands; pulling the joined extrudates through a common longitudinal channel of a sizing box at sub-atmospheric pressure, the cellular portion of the joined extrudates being in substantial sealing engagement with the portion of the channel entrance through which it passes and the non-cellular portion passing into the channel with a clearance of from about 10 to about 20 mils; and cooling the joined extrudates while under sub-atmospheric pressure.
Claim 4
Independent Claim
143 words
A method of dual extrusion for forming a cellular resin and a non-cellular resin into a unitary composite profile, said method comprising: extruding the cellular and non-cellular resins through separate extruders, through a common cross-head and a die having orifices whose profiles overlap to form overlapping extrudates; encapsulating an overlapped extrudate in an overlapping extrudate by pulling the extrudates through an expansion zone to impose a longitudinal tension on the extrudates while the cellular extrudate expands; pulling the joined extrudates through a common longitudinal channel of a sizing box at sub-atmospheric pressure, the cellular portion of the joined extrudates being in substantial sealing engagement with the portion of the channel entrance through which it passes and the non-cellular portion passing into the channel with a clearance of from about 10 to about 20 mils; and cooling the joined extrudates while under sub-atmospheric pressure.
Claim 5
Dependent Claim
25 words
The method of claim 2 wherein the encapsulation is initiated while the surface temperatures of the extrudates are sufficient to cause fusion of the extrudates.
Claim 6
Dependent Claim
16 words
The method of claim 2 wherein the resins remain separated during their passage through the die.
Claim 7
Dependent Claim
21 words
The method of claim 2 wherein the resins remain separated for from about 75% to about 90% of the die thickness.
Claim 8
Dependent Claim
28 words
The method of claim 2 wherein the encapsulation of a non-cellular extrudate by a cellular extrudate is aided by deflecting the expanding cellular extrudate toward the non-cellular extrudate.
Claim 9
Dependent Claim
40 words
The method of claim 2, wherein the cell structure of the cellular resin is supported by a vacuum while in a sizing box at sub-atmospheric pressure so that a non-cellular extrude may be fused to said cellular extrude without deformation.
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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) | 1990-08-31 | 1991-03-02 | 1991-09-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-08-31 | 1995-03-02 | 1995-09-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-08-31 | 1999-03-02 | 1999-09-01 | $7700.00 | Window Closed / Lapsed |