Patent US3773451A successfully refreshed from Google Patents.
US3773451A
Expired / Lapsed
US
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Screw-type injection-molding machine
Assignee: Eckert Ziegler dt GmbH
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Filing: 1971-06-28
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Granted: 1973-11-20
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Expires: 1991-06-28
Abstract
Abstract An injection-molding machine with a rotatable and axially displaceable feed screw, serving to plasticize the moldable material and thereafter to inject it into a mold, is advanced and retracted repeatedly during a single molding operation to inject the plasticized material in several stages into the mold which is maintained at a relatively low temperature until the mold is filled. The termination of injection and the switchover to curing temperature occurs in response to a slight expansion of the mold upon complete filling.
Inventors
- 👤 F Bielfeldt
- 👤 J Neureuther
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 09:20
CPC Classifications
B; B29; B29C; B29C45/00; B29C45/17; B29C45/76; B29C45/80; B29C45/46; B29C45/47; B29C45/50; B29C45/7613
Claims Analysis
Total Claims: 0
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US3667884A
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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 |