US3809733A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of double layer laminates
Assignee: Imperial Chemical Industries Ltd
•
Filing: 1972-04-24
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Granted: 1974-05-07
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Expires: 1992-04-24
Abstract
Abstract A LAMINATE OF SYNTHETIC POLYMERIC MATERIALS IS PRODUCED BY AN INJECTION MOULDING PROCESS IN WHICH THE FIRST LAYER OF THE LAMINATE IS INJECTED THROUGH A FIRST SPURE TO FILL THE MOULD CAVITY WHICH IS THEN ENLARGED AND A SECOND AMOUNT OF MATERIAL IS INJECTED INTO THE MOULD THROUGH A SECOND SPURE WHICH EXTENDS THROUGH THE FIRST LAYER. ONE OF THE CHARGES, PREFERABLY THE SECOND, MAY CONVENIENTLY BE OF FOAMABLE MATERIAL.
Inventors
- 👤 D Sandiford
- 👤 A Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 16:29
CPC Classifications
B; B29; B29C; B29C44/00; B29C44/02; B29C44/08; B29C44/083; B29C44/086; B29C45/00; B29C45/16; B29C45/1635; B29C2045/167; Y; Y10; Y10S; Y10S264/00; Y10S264/83; Y10S273/00; Y10S273/06; Y10S425/00; Y10S425/812
Claims Analysis
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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) | 1977-05-06 | 1977-11-05 | 1978-05-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-05-06 | 1981-11-05 | 1982-05-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-05-06 | 1985-11-05 | 1986-05-07 | $7700.00 | Window Closed / Lapsed |