US3767742A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of injection moulding a hinged article having foam cored members joined by an unfoamed hinge
Assignee: Imperial Chemical Industries Ltd
•
Filing: 1970-11-30
•
Granted: 1973-10-23
•
Expires: 1990-11-30
Abstract
Abstract A METHOD OF FORMING A HINGED ARTICLE WHICH COMPRISES, INJECTING AN UNFOAMABLE POLYMERIC MATERIAL INTO A MOULD CAVITY, SUBSEQUENTLY INJECTING A FOAMABLE POLYMERIC COMPOSITION INTO THE MOULD, ENLARGING THE MOULD CAVITY EXCEPT AT THE HINGE DEFINING COMPONENT OF THE MOULD TO CAUSE FOAMING EXCEPT IN THE AREA OF THE HINGE DEFINING COMPONENT AND ALLOWING THE MATERIAL TO SET TO FORM TWO FOAM CORED MEMBERS CONNECTED BY A HINGE OF UNFOAMED MATERIAL.
Inventors
- 👤 M Robin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:33
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; B29C45/17; B29C45/46; B29C45/56; B29L; B29L2031/00; B29L2031/22; Y; Y10; Y10S; Y10S264/00; Y10S264/04; Y10S264/83; Y10T; Y10T428/00; Y10T428/24; Y10T428/24355; Y10T428/24438; Y10T428/24479; Y10T428/24496; Y10T428/24504; Y10T428/24628; Y10T428/249921; Y10T428/249953; Y10T428/249987; Y10T428/249988; Y10T428/249989
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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) | 1976-10-22 | 1977-04-23 | 1977-10-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-22 | 1981-04-23 | 1981-10-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-22 | 1985-04-23 | 1985-10-23 | $7700.00 | Window Closed / Lapsed |