US3674401A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for injection molding articles of foam material
Assignee: Farrel Corp
•
Filing: 1969-12-22
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Granted: 1972-07-04
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Expires: 1989-12-22
Abstract
Abstract APPARATUS FOR MOLDING ARTICLES OF FOAMED MATERIAL COMPRISING A CHAMBER IN WHICH A MIXTURE OF ORGANIC POLYMERIC MATERIAL AND BLOWING AGENT IS FORMED AT A TEMPERATURE BELOW THE FOAMING TEMPERATURE OF THE BLOWING AGENT, MOLD HAVING A MOLD CAVITY, AND MEANS FOR RESISTING FLOW OF THE MIXTURE FROM THE CHAMBER TO THE MOLD MEANS TO IMPART HEAT TO THE MIXTURE. THE HEAT IMPARTED IS OF A MAGNITUDE SUFFICIENT TO RAISE THE TEMPERATURE OF THE MIXTURE TO THE FOAMING TEMPERATURE OF THE BLOWING AGENT.
Inventors
- 👤 Rupert E Annis Jr
- 👤 William T Kyritsis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 23:11
CPC Classifications
B; B29; B29C; B29C44/00; B29C44/34; B29C44/36; B29C44/38; B29C44/42; B29C44/424; Y; Y10; Y10S; Y10S264/00; Y10S264/19; 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) | 1975-07-04 | 1976-01-03 | 1976-07-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-04 | 1980-01-03 | 1980-07-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-04 | 1984-01-03 | 1984-07-04 | $7700.00 | Window Closed / Lapsed |