US3143767A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multiple screw mixing and extrusion apparatus
Assignee: Mannesmann Demag Krauss Maffei GmbH
•
Filing: 1961-07-06
•
Granted: 1964-08-11
•
Expires: 1981-07-06
Abstract
No abstract record available.
Inventors
- 👤 Wirth Thomas
- 👤 Ellermann Wilhelm
- 👤 Hartmann Kurt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 17:30
CPC Classifications
B; B29; B29C; B29C48/00; B29C48/25; B29C48/30; B29C48/345; B29C48/36; B29C48/395; B29C48/40; B29C48/405; B29C48/03; B29C48/05
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
89 words
AN EXTRUSION APPARATUS COMPRISING IN COMBINATION A PLURALITY OF ADJACENT SCREW CONVEYER SHAFTS, SAID SCREW CONVEYER SHAFTS HAVING EACH AN INNER SCREW CONVEYER PORTION AND AN OUTER SCREW CONVEYER PORTION, SAID INNER SCREW CONVEYER PORTION HAVING A LARGER DIAMETER THAN SAID OUTER SCREW CONVEYER PORTION, COMMON CASING MEANS FOR SAID INNER SCREW CONVEYER PORTIONS, SEPARATE CASING MEANS FOR SAID OUTER SCREW CONVEYER PORTIONS, SAID SEPARATE CASING MEANS EXTENDING IN SPACED RELATIONSHIP OVER AT LEAST A PORTION OF THEIR AXIAL LENGTH TO PROVIDE A SPACE BETWEEN ADJACENT SEPARATE CASING MEANS,
Claim 2
Dependent Claim
89 words
AN EXTRUSION APPARATUS COMPRISING IN COMBINATION A PLURALITY OF ADJACENT SCREW CONVEYER SHAFTS, SAID SCREW CONVEYER SHAFTS HAVING EACH AN INNER SCREW CONVEYER PORTION AND AN OUTER SCREW CONVEYER PORTION, SAID INNER SCREW CONVEYER PORTION HAVING A LARGER DIAMETER THAN SAID OUTER SCREW CONVEYER PORTION, COMMON CASING MEANS FOR SAID INNER SCREW CONVEYER PORTIONS, SEPARATE CASING MEANS FOR SAID OUTER SCREW CONVEYER PORTIONS, SAID SEPARATE CASING MEANS EXTENDING IN SPACED RELATIONSHIP OVER AT LEAST A PORTION OF THEIR AXIAL LENGTH TO PROVIDE A SPACE BETWEEN ADJACENT SEPARATE CASING MEANS,
References Cited (Backward Citations)
USRE23948E
Cited
US806502A
Cited
US2494891A
Cited
US2693348A
Cited
DE962746C
Cited
US2802238A
Cited
US2774107A
Cited
US2942294A
Cited
GB828083A
Cited
US2946089A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-08-11 | 1968-02-10 | 1968-08-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-08-11 | 1972-02-10 | 1972-08-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-08-11 | 1976-02-10 | 1976-08-11 | $7700.00 | Window Closed / Lapsed |