US3825637A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Injection molding of foam cored sandwich structures
Assignee: Imperial Chemical Industries Ltd
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Filing: 1971-05-03
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Granted: 1974-07-23
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Expires: 1991-05-03
Abstract
Abstract INJECTION MOLDED SOLID SKINNED FOAM CORE SANDWICH STRUCTURES ARE MADE USING AN ENLARGEABLE MOLD. DURING THE MOLDING OPERATION, THIN, NON-FOAMED PORTIONS, SUCH AS HINGES, OR AREAS WHICH CAN SUBSEQUENTLY BE REMOVED TO PROVIDE ORIFICES IN THE MOLDING, ARE MADE AFTER THE MOLD CAVITY HAS BEEN FILLED WITH THE FOAMABLE COMPOSITION BY EFFECTING RELATIVE MOVEMENT BETWEEN A TOOL DEFINING THE NON-FOAMED PORTION AND ONE OF THE OPPOSED SURFACES OF THE MOLD.
Inventors
- 👤 M Robin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 19:04
CPC Classifications
B; B29; B29C; B29C45/00; B29C45/0081; B29C44/00; B29C44/02; B29C44/04; B29C44/0461; B29C44/08; B29C44/083; B29C44/086; B29C45/14; B29C45/14336; B29C45/16; B29C45/1642; B29C45/17; B29C45/46; B29C45/56; B29C45/5675; B29L; B29L2031/00; B29L2031/22; Y; Y10; Y10S; Y10S264/00; Y10S264/83; Y10T; Y10T428/00; Y10T428/24; Y10T428/2419; Y10T428/24215; Y10T428/249921; Y10T428/249953; Y10T428/249981; Y10T428/249987; Y10T428/249988
Claims Analysis
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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) | 1977-07-22 | 1978-01-21 | 1978-07-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-07-22 | 1982-01-21 | 1982-07-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-07-22 | 1986-01-21 | 1986-07-23 | $7700.00 | Window Closed / Lapsed |