US3776989A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for injection molding articles of foam material involving autoge-nous flow
Assignee: Farrel Corp
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Filing: 1972-05-08
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Granted: 1973-12-04
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Expires: 1992-05-08
Abstract
Abstract A PROCESS OF MOLDING ARTICLES OF FOAM MATERIAL COM- PRISING FORMING A MIXTURE OF ORGANIC POLYMERIC RESIN MATERIAL AND A BLOWING AGENT IN A CHAMBER AT A TEMPERATURE BELOW THE FOAMING TEMPERATURE OF THE RESIN-BLOWING AGENT SYSTEM AND FORCING THE MIXTURE THROUGH A RESTRICTION FOR RESISTING THE FLOW OF THE MATERIAL TO IMPART HEAT TO THE MATERIAL, THE HEAT IMPARTED BEING OF A MAGNITUDE SUFFICIENT TO RAISE THE TEMPERATURE OF THE MIXTURE TO THE FOAMING TEMPERATURE, AND DISCHARGING THE MIXTURE, AT ITS FOAMING TEMPERATURE, INTO A MOLD CAVITY.
Inventors
- 👤 R Annis
- 👤 W Kyritsis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 22:02
CPC Classifications
B; B29; B29C; B29C44/00; B29C44/34; B29C44/36; B29C44/38; B29C44/42; B29C44/421; Y; Y10; Y10S; Y10S264/00; Y10S264/05; Y10S264/16; Y10S264/83; Y10T; Y10T428/00; Y10T428/249921; Y10T428/249953; Y10T428/249987; Y10T428/249988; Y10T428/249989
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) | 1976-12-03 | 1977-06-04 | 1977-12-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-03 | 1981-06-04 | 1981-12-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-03 | 1985-06-04 | 1985-12-04 | $7700.00 | Window Closed / Lapsed |