US4289408A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Marbleization of plastic materials
Assignee: Gillette Co LLC
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Filing: 1978-10-31
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Granted: 1981-09-15
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Expires: 1998-10-31
Abstract
Abstract Methods and apparatus for marbleizing molded parts produced by screw extruder machines. Liquid colorant is advantageously injected at a comparatively high pressure into a melt containing portion of the machine between the screw and its housing, where the melt is either completely molten or more than fifty percent molten.
Inventors
- 👤 James L. Langlois
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 16:50
CPC Classifications
B; B29; B29C; B29C45/00; B29C45/16; B29C45/1634; B29C48/00; B29C48/25; B29C48/285; B29C48/29; B29C48/03; B29K; B29K2105/00; B29K2105/0005
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
62 words
Apparatus for marbleizing molded materials, comprising a barrel containing an injection screw for feeding the material to be molded; means for injecting liquid colorant into the feed material where the screw is present; and means for reciprocating said injection screw to feed the material with said injected colorant and eject the material colorant directly into a mold to produce a marbleized part.
Claim 2
Dependent Claim
62 words
Apparatus for marbleizing molded materials, comprising a barrel containing an injection screw for feeding the material to be molded; means for injecting liquid colorant into the feed material where the screw is present; and means for reciprocating said injection screw to feed the material with said injected colorant and eject the material colorant directly into a mold to produce a marbleized part.
Claim 3
Dependent Claim
57 words
The apparatus of claim 1 wherein said liquid colorant is injected into said machine between a heated surface of said screw and a heated interior surface of said barrel to form a band of colorant at an intermediate level between the two surfaces and said band of colorant is maintained at an intermediate level within said melt.
Claim 4
Dependent Claim
18 words
The apparatus of claim 1 wherein said barrel is heated to facilitate the flow of the molten material.
Claim 5
Dependent Claim
19 words
The apparatus of claim 1 wherein a plurality of injections of liquid colorant are made into said molten material.
Claim 6
Dependent Claim
22 words
The apparatus of claim 4 wherein each injection of liquid colorant is of a different color to provide a multicolor marbleization effect.
Claim 7
Dependent Claim
17 words
The apparatus as defined in claim 4 wherein the injection is made through a pressurized injector fitting.
Claim 8
Dependent Claim
11 words
Apparatus as defined in claim 1 wherein said mold is unbalanced.
Claim 9
Dependent Claim
35 words
The apparatus of claim 1 wherein the injecting means is proportioned for the injection of liquid colorant which has a relative viscosity which is at least substantially the same as that of the molten material.
Claim 10
Dependent Claim
16 words
The apparatus as defined in claim 1 wherein said injection screw is of the reciprocating type.
Claim 11
Dependent Claim
30 words
The apparatus as defined in claim 18 wherein said screw has a shut-off and injection of said liquid colorant is made just beyond the most rearward position of said shut-off.
References Cited (Backward Citations)
US3461498A
Cited
US3583679A
Cited
US3894823A
Cited
US4017225A
Cited
US4183673A
Cited
US4135870A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-09-14 | 1985-03-16 | 1985-09-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-09-14 | 1989-03-16 | 1989-09-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-09-14 | 1993-03-16 | 1993-09-15 | $7700.00 | Window Closed / Lapsed |