US3632256A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Extrusion-compounding apparatus
Assignee: Union Carbide Corp
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Filing: 1969-03-19
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Granted: 1972-01-04
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Expires: 1989-03-19
Abstract
Abstract The disclosure relates to apparatus for the extrusion compounding of plastic material employing extruder screw means mounted in extruder housing means having a plurality of plastic material feed port means and compounded plastic material discharge port means arranged to define a plurality of separate compounding zones in tandem along the length of said extruder housing means.
Inventors
- 👤 Howard Edward Kasting
- 👤 Roger Brown Staub
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 09:19
CPC Classifications
B; B29; B29B; B29B7/00; B29B7/30; B29B7/34; B29B7/38; B29B7/46; B29B7/48; B29B7/484; B29C; B29C48/00; B29C48/03; B29C48/25; B29C48/36; B29C48/395; B29C48/455
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
96 words
Apparatus for the extrusion compounding of plastic material comprising extruder screw means mounted in extruder housing means having a plurality of plastic material feed port means and compounded plastic material discharge port means arranged to define a plurality of separated compounding zones in tandem along the length of said extruder housing means, said Extruder screw means having, between each of said compounding zones, a reverse pitch screw thread section contiguous with each of the forward compounding zone forward pitch screw thread sections of said compounding zones, said extruder screw means comprising twin, corotating, intermeshing extruder screws.
Claim 2
Dependent Claim
96 words
Apparatus for the extrusion compounding of plastic material comprising extruder screw means mounted in extruder housing means having a plurality of plastic material feed port means and compounded plastic material discharge port means arranged to define a plurality of separated compounding zones in tandem along the length of said extruder housing means, said Extruder screw means having, between each of said compounding zones, a reverse pitch screw thread section contiguous with each of the forward compounding zone forward pitch screw thread sections of said compounding zones, said extruder screw means comprising twin, corotating, intermeshing extruder screws.
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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) | 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 |