Patent US3913796A successfully refreshed from Google Patents.
US3913796A
Expired / Lapsed
US
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Vent-type injection molding machine
Assignee: Nissei Plastic Industrial Co Ltd
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Filing: 1973-10-31
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Granted: 1975-10-21
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Expires: 1993-10-31
Abstract
Abstract A vent-type injection molding machine which comprises: a preheating cylinder having an extrusion screw therein; an injection cylinder having an injection screw therein; and a supply tube connecting the downstream end of said preheating cylinder and the upstream portion of said injection cylinder; and is characterized in that said supply tube is provided with a vent and sight holes, thus the gases produced in the preheating of the material can be effectively removed through the vent before the material is fed to said injection screw, and the feed of the material from the extrusion screw to the injection screw can be well observed from the outside.
Inventors
- 👤 Katashi Aoki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 22:27
CPC Classifications
B; B29; B29C; B29C45/00; B29C45/17; B29C45/46; B29C45/47; B29C45/48; B29C45/58; B29C45/63; B29C48/00; B29C48/25; B29C48/36; B29C48/375; B29C48/38; B29C48/50; B29C48/76; B29C48/765; B29C48/766; B29C48/03
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
115 words
A vent-type injection molding machine which comprises: a preheating cyclinder having an extrusion screw therein for heating resin material to a semi-molten condition; an injection cylinder having an injection screw therein for injecting the resin material into a mold; a supply tube connecting the downstream end of said preheating cylinder and the upstream portion of said injection cylinder and is characterized in that said supply tube is provided with a vent and sight holes wherein said extrusion screw is provided with a head having a plurality of depressions, and said preheating cylinder is provided with a bush member having an aperture, thus extruding the semi-molten material in the form of lumps with a certain size.
Claim 2
Dependent Claim
115 words
A vent-type injection molding machine which comprises: a preheating cyclinder having an extrusion screw therein for heating resin material to a semi-molten condition; an injection cylinder having an injection screw therein for injecting the resin material into a mold; a supply tube connecting the downstream end of said preheating cylinder and the upstream portion of said injection cylinder and is characterized in that said supply tube is provided with a vent and sight holes wherein said extrusion screw is provided with a head having a plurality of depressions, and said preheating cylinder is provided with a bush member having an aperture, thus extruding the semi-molten material in the form of lumps with a certain size.
References Cited (Backward Citations)
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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) | 1978-10-20 | 1979-04-21 | 1979-10-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-10-20 | 1983-04-21 | 1983-10-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-10-20 | 1987-04-21 | 1987-10-21 | $7700.00 | Window Closed / Lapsed |