Patent US3605188A successfully refreshed from Google Patents.
US3605188A
Expired / Lapsed
US
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Plastic mixer and extruder
Assignee: NRM Corp
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Filing: 1969-08-08
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Granted: 1971-09-20
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Expires: 1989-08-08
Abstract
Abstract A TWIN CONICAL SCREW PLASTIC MIXER AND EXTRUDER HAVING INTERMESHING CONICAL SCREWS ROTATABLE WITHIN TAPERED, INTERSECTING CYLINDER BORES, AND MECHANISM FOR AXIALLY ADJUSTING THE SCREWS WITH RESPECT TO THE TAPERED CYLINDER BORES THUS TO VARY THE DEGREE OF MIXING OF THE MATERIAL ACCORDING TO THE LEAKAGE FLOW OF MATERIAL OVER THE SCREW FLIGHTS. WHEN THE SCREW AXES CONVERGE TOWARD THE DIE INLET, THE ADJUSTING MECHANISM ALSO CHANGES THE DEGREE OF INTERMESHING OF THE SCREW FLIGHTS TO FURTHER INFLUENCE THE MIXING ACTION.
Inventors
- 👤 William S Mccormick
- 👤 William R Topper
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 09:04
CPC Classifications
B; B29; B29C; B29C48/00; B29C48/25; B29C48/252; B29B; B29B7/00; B29B7/30; B29B7/34; B29B7/38; B29B7/46; B29B7/48; B29B7/484; B29B7/488; B29B7/489; B29C48/36; B29C48/395; B29C48/40; B29C48/402; B29C48/50; B29C48/505; B29C48/52; B29C48/525; B29C48/03
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) | 1974-09-19 | 1975-03-21 | 1975-09-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-19 | 1979-03-21 | 1979-09-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-19 | 1983-03-21 | 1983-09-20 | $7700.00 | Window Closed / Lapsed |