US4128385A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Injection molding apparatus
Assignee: Packaging Resources Inc
•
Filing: 1976-01-28
•
Granted: 1978-12-05
•
Expires: 1996-01-28
Abstract
Abstract An improved injection mold apparatus and method includes a gate interposed 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
2026-11-03 07:20
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: 3
Claim 1
Independent Claim
103 words
In a molding apparatus of the type wherein resin in a molten state is injected from a sprue passageway and through a gate to fill a mold chamber, said gate having interior wall means defining a gate opening, said apparatus including means for maintaining molten the plastic remaining in said sprue passageway immediately adjacent said gate, the improvements wherein said interior wall means define a gate opening having a periphery exceeding the periphery of a circular opening of the same area, and including cooling means for extracting heat from said gate to cool resin remaining in said gate after filling said mold chamber.
Claim 2
Dependent Claim
103 words
In a molding apparatus of the type wherein resin in a molten state is injected from a sprue passageway and through a gate to fill a mold chamber, said gate having interior wall means defining a gate opening, said apparatus including means for maintaining molten the plastic remaining in said sprue passageway immediately adjacent said gate, the improvements wherein said interior wall means define a gate opening having a periphery exceeding the periphery of a circular opening of the same area, and including cooling means for extracting heat from said gate to cool resin remaining in said gate after filling said mold chamber.
Claim 3
Dependent Claim
35 words
The molding apparatus of claim 1 wherein said gate is defined by a one-piece bushing and said means for maintaining molten the plastic remaining in said sprue passageway comprises a heater extending into said bushing.
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) | 1981-12-04 | 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 |