US3698849A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Injection molding assembly
Assignee: Shell USA Inc
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Filing: 1969-04-08
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Granted: 1972-10-17
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Expires: 1989-04-08
Abstract
Abstract Cellular organic polymer articles are made by an injection molding method in which a foamable thermoplastic melt is injected from an extruding device through a nozzle and sprue bush into a mold, the sprue bush being thermally insulated from the injection nozzle and the nozzle being closed at a position near its outlet after the filling step and maintained in injection position throughout the molding cycle.
Inventors
- 👤 Jan Czerski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 19:36
CPC Classifications
B; B29; B29C; B29C44/00; B29C44/02; B29C44/08; B29C44/083; B29C44/086; B29C44/34; B29C44/36; B29C44/38; B29C44/42; B29C44/424; B29C44/425; B29C45/00; B29C45/17; B29C45/72; B29C45/73
Claims Analysis
Total Claims: 0
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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) | 1975-10-17 | 1976-04-17 | 1976-10-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-17 | 1980-04-17 | 1980-10-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-17 | 1984-04-17 | 1984-10-17 | $7700.00 | Window Closed / Lapsed |