US3801684A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Injection moulding
Assignee: Imperial Chemical Industries Ltd
•
Filing: 1972-01-27
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Granted: 1974-04-02
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Expires: 1992-01-27
Abstract
Abstract SANDWICH MOULDING PROCESS WHEREIN SKIN AND CORE MATERIALS ARE SEQUENTIALLY INJECTED INTO A MOULD CAVITY FROM SEPARATE INJECTION BARRELS THROUGH A COMMON SPRUE, SKIN MATERIAL BEING CAUSED TO FLOW UP THE CORE FEED CHANNEL, TOWARDS THE CORE INJECTION BARREL WHILE SKIN MATERIAL IS BEING INJECTED INTO THE MOULD CAVITY.
Inventors
- 👤 K Schrewe
- 👤 U Knipp
- 👤 A Ravasz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 20:17
CPC Classifications
B; B29; B29C; B29C45/00; B29C45/16; B29C45/1642; B29C44/00; B29C44/02; B29C44/04; B29C44/0492; B29K; B29K2101/00; B29K2101/10; Y; Y10; Y10S; Y10S264/00; Y10S264/83
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) | 1977-04-01 | 1977-10-01 | 1978-04-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-04-01 | 1981-10-01 | 1982-04-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-04-01 | 1985-10-01 | 1986-04-02 | $7700.00 | Window Closed / Lapsed |