Patent US3632729A successfully refreshed from Google Patents.
US3632729A
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US
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Method of injection molding with thermosetting resins
Assignee: Eckert and Ziegler GmbH
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Filing: 1969-08-21
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Granted: 1972-01-04
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Expires: 1989-08-21
Abstract
Abstract A THERMOSETTING RESIN IS INJECTED INTO A PARTIALLY OPEN SEPARABLE MOLD HAVING A MOLD CAVITY. THIS MOLD IS THEN PARTIALLY CLOSED TO PRECOMPRESS THE RESIN AND IS HEATED TO SOFTEN IS. AFTER A PREDETERMINED AMOUNT OF TIME, THE MOLD IS FULLY CLOSED TO COMPRESS THE MASS OF RESIN AND TO FORCE IT INTO EVERY PORTION OF THE CAVITY. A TELESCOPING MOLD AND A VALVE BETWEEN THE MOLD AND THE INJECTION HEAD ARE USED TO PREVENT THE MASS FORM ESCAPING DURING COMPRESSION.
Inventors
- 👤 Friedrich Bernd Bielfeldt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 05:41
CPC Classifications
B; B29; B29C; B29C45/00; B29C45/17; B29C45/46; B29C45/56; B29C45/561; B29C45/0001; B29C2045/5625; B29K; B29K2101/00; B29K2101/10; Y; Y10; Y10S; Y10S264/00; 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) | 1975-01-03 | 1975-07-05 | 1976-01-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-03 | 1979-07-05 | 1980-01-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-03 | 1983-07-05 | 1984-01-04 | $7700.00 | Window Closed / Lapsed |