Patent US4819042A successfully refreshed from Google Patents.
Patent US3829548A successfully refreshed from Google Patents.
US3829548A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Injection molding process
Assignee: Dart Container Corp
•
Filing: 1973-06-20
•
Granted: 1974-08-13
•
Expires: 1993-06-20
Abstract
Abstract The process for injection molding relatively thin walled and relatively deep hollow plastic articles with accurately controlled wall thicknesses.
Inventors
- 👤 B Edwards
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 08:44
CPC Classifications
B; B29; B29C; B29C45/00; B29C45/17; B29C45/26; B29C45/36; B29C45/0046; B29C2045/0051
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
177 words
The method for injection molding a closed-end hollow elongated plastic article to maintain the mold parts substantially positively positioned relative to each other during molding, comprising forming the female mold in the outer configuration of the side walls of said article and the male mold in the inner configuration of the side wall of said article to define said article in the cavity between said male and female molds, directing molten plastic through the female mold into the cavity at the closed end of the article and in a direction along the longitudinal center axis of the cavity, next directing the molten plastic substantially immediately circumferentially about the male mold in a restricted area immediately adjacent the entrance of the molten plastic from the female mold into the cavity, thereafter directing the molten plastic through the cavity in a direction substantially the reverse of the direction of entrance of the molten plastic from the female mold into the cavity, and thereafter further reversing the direction of the molten plastic radially outwardly and then longitudinally of the cavity.
Claim 2
Independent Claim
177 words
The method for injection molding a closed-end hollow elongated plastic article to maintain the mold parts substantially positively positioned relative to each other during molding, comprising forming the female mold in the outer configuration of the side walls of said article and the male mold in the inner configuration of the side wall of said article to define said article in the cavity between said male and female molds, directing molten plastic through the female mold into the cavity at the closed end of the article and in a direction along the longitudinal center axis of the cavity, next directing the molten plastic substantially immediately circumferentially about the male mold in a restricted area immediately adjacent the entrance of the molten plastic from the female mold into the cavity, thereafter directing the molten plastic through the cavity in a direction substantially the reverse of the direction of entrance of the molten plastic from the female mold into the cavity, and thereafter further reversing the direction of the molten plastic radially outwardly and then longitudinally of the cavity.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-08-12 | 1978-02-11 | 1978-08-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-08-12 | 1982-02-11 | 1982-08-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-08-12 | 1986-02-11 | 1986-08-13 | $7700.00 | Window Closed / Lapsed |