US3588956A
Expired / Lapsed
US
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Apparatus and method for controlling temperature in a feed screw
Assignee: Phillips Petroleum Co
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Filing: 1968-12-16
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Granted: 1971-06-29
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Expires: 1988-12-16
Abstract
Abstract A FEED SCREW FOR ADVANCING A THERMOPLASTIC RESIN HAS AN INTERIOR BORE THROUGH WHICH A COOLING MEDIUM IS ADAPTED TO BE CIRCULATED BY CONDUITS ENTERING FROM AN OPEN ENTRANCE END OF THE BORE. ADJUSTABLE MEANS INSERTED INTO THE BORE FORMS A DESIRED BORE SEGMENT THROUGH WHICH THE COOLING MEDIUM IS FREELY CIRCULATED, THEREBY PROVIDING A DESIRED TEMPERATURE GRADIENT ALONG THE SCREW LENGTH.
Inventors
- 👤 Robert J Poux
- 👤 Peter R Deutsch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 01:48
CPC Classifications
B; B29; B29C; B29C45/00; B29C45/17; B29C45/72; B29C45/74; B29C48/00; B29C48/25; B29C48/36; B29C48/50; B29C48/505; B29C48/51; B29C48/515; B29C48/78; B29C48/80; B29C48/84; B29C48/845; B29C48/85; B29C48/875; B29C48/03
Claims Analysis
Total Claims: 0
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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) | 1974-06-28 | 1974-12-28 | 1975-06-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-28 | 1978-12-28 | 1979-06-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-28 | 1982-12-28 | 1983-06-29 | $7700.00 | Window Closed / Lapsed |