US4125582A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Marbleization of plastic materials
Assignee: Gillette Co LLC
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Filing: 1976-02-23
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Granted: 1978-11-14
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Expires: 1996-02-23
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
2026-10-26 00:44
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: 6
Claim 1
Independent Claim
94 words
The method of marbleizing parts molded with a screw injection machine which comprises (a) injecting liquid colorant into a melt within the machine between a heated surface of the screw and a heated interior surface of the barrel for the screw at a comparatively high pressure to form a band of colorant at an intermediate level between the two surfaces; (b) ejecting the melt from the machine with said band of colorant maintained at an intermediate level within the melt; and (c) forcing the ejected melt into a mold to produce a marbleized part.
Claim 2
Independent Claim
94 words
The method of marbleizing parts molded with a screw injection machine which comprises (a) injecting liquid colorant into a melt within the machine between a heated surface of the screw and a heated interior surface of the barrel for the screw at a comparatively high pressure to form a band of colorant at an intermediate level between the two surfaces; (b) ejecting the melt from the machine with said band of colorant maintained at an intermediate level within the melt; and (c) forcing the ejected melt into a mold to produce a marbleized part.
Claim 3
Dependent Claim
10 words
The method of claim 1 wherein said mold is balanced.
Claim 4
Dependent Claim
10 words
The method of claim 1 wherein said mold is unbalanced.
Claim 5
Dependent Claim
19 words
The method of claim 1 wherein said colorant is injected into said machine where said melt is completely molten.
Claim 6
Dependent Claim
30 words
The method of claim 1 wherein said screw injection machine is of the reciprocating type, and the injection is made in the vicinity of a non-return valve for said screw.
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) | 1981-11-13 | 1982-05-15 | 1982-11-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-11-13 | 1986-05-15 | 1986-11-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-11-13 | 1990-05-15 | 1990-11-14 | $7700.00 | Window Closed / Lapsed |