US3773873A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of injection molding foamable plastic with minimized wastage
Assignee: Honeywell International Inc
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Filing: 1970-06-22
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Granted: 1973-11-20
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Expires: 1990-06-22
Abstract
Abstract THIS DISCLOSURE IS DIRECTED TO A METHOD FOR INJECTION MOLDING. PREMATURE FOAMING AND SETTING OF FOAMABLE MOLDING MATERIALS IS PREVENTED BY ACCOMPLISHING THE INJECTION OF THE FOAMABLE MOLDING MATERIAL INTO A MOLD CAVITY HAVING A GASEOUS SUBSTANCE THEREIN AT A PRESSURE IN EXCESS OF THAT REQUIRED TO PREVENT FOAMING OF THE MOLDING MATERIAL. PLANNED WASTAGE OF MOLDING MATERIAL IS MINIMIZED BY PROVIDING PISTIONS IN THE RUNNERS WHICH CARRY THE MOLDING MATERIALS TO THE MOLD, WHICH PISTONS FORCE EXCESS MOLDING MATERIAL AWAY FROM THE MOLD SO AS TO RECOMPRESS AND RECOVER THE MATERIAL, THEREBY TO BE USED IN THE NEXT SUBSEQUENT MOLDING CYCLE.
Inventors
- 👤 A Spaak
- 👤 C Weir
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 09:56
CPC Classifications
B; B29; B29C; B29C45/00; B29C45/17; B29C45/26; B29C45/27; B29C45/28; B29C45/2806; B29C44/00; B29C44/02; B29C44/10; B29C44/105; Y; Y10; Y10S; Y10S264/00; Y10S264/05; Y10S264/14; Y10S264/17; Y10S264/83
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) | 1976-11-19 | 1977-05-21 | 1977-11-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-19 | 1981-05-21 | 1981-11-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-19 | 1985-05-21 | 1985-11-20 | $7700.00 | Window Closed / Lapsed |