US4128613A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Injection molding method
Assignee: Packaging Resources Inc
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Filing: 1977-02-08
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Granted: 1978-12-05
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Expires: 1997-02-08
Abstract
Abstract An improved injection mold method includes interposing a gate between a mold chamber or cavity and a runner passageway. The cross sectional opening of the gate is non-circular in shape and may comprise a plurality of foliations. The non-circular shape of gate opening enables the provision of sufficient area to insure adequate filling and compacting of molding material in a mold chamber within a reasonable time interval and also avoids difficult problems such as drooling, stringing, and/or freeze-off or blocking of material-supply passageways.
Inventors
- 👤 David O. Allen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 15:07
CPC Classifications
B; B29; B29C; B29C45/00; B29C45/17; B29C45/26; B29C45/27; B29C45/2701; B29C45/2708; B29C2045/2714; Y; Y10; Y10S; Y10S425/00; Y10S425/227
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
117 words
An improved method of injection molding a molten resin comprising the steps of interposing between a mold chamber and a sprue passageway a gate having wall means defining a gate opening which has a length of perimeter greater than the circumference of a circular opening having a cross-sectional area equal to that of said gate opening, effecting a flow of said resin from said sprue passageway through said gate opening until said chamber is filled with resin, maintaining resin remaining in said sprue passageway immediately adjacent said gate in a molten state, cooling resin remaining in said gate sufficiently to avoid drooling, and thereafter separating resin filling said mold chamber from said gate and resin remaining therein.
Claim 2
Dependent Claim
117 words
An improved method of injection molding a molten resin comprising the steps of interposing between a mold chamber and a sprue passageway a gate having wall means defining a gate opening which has a length of perimeter greater than the circumference of a circular opening having a cross-sectional area equal to that of said gate opening, effecting a flow of said resin from said sprue passageway through said gate opening until said chamber is filled with resin, maintaining resin remaining in said sprue passageway immediately adjacent said gate in a molten state, cooling resin remaining in said gate sufficiently to avoid drooling, and thereafter separating resin filling said mold chamber from said gate and resin remaining therein.
Claim 3
Dependent Claim
26 words
The method of claim 1 wherein the step of cooling the resin remaining in said gate is continued until resin remaining in said gate opening solidifies.
Claim 4
Dependent Claim
13 words
The method of claim 1 wherein said gate opening has a multifoliated shape.
References Cited (Backward Citations)
FR996244A
Cited
US2698464A
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US2773284A
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US2865050A
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US3031722A
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US3013303A
Cited
US3231938A
Cited
US3358689A
Cited
DE1951944A1
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US3800027A
Cited
US3822856A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-12-04 | 1982-06-05 | 1982-12-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-12-04 | 1986-06-05 | 1986-12-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-12-04 | 1990-06-05 | 1990-12-05 | $7700.00 | Window Closed / Lapsed |