Patent JPS5865402A successfully refreshed from Google Patents.
US3425640A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for the continuous transportation of pulverulent or fibrous material
Assignee: Kalle GmbH and Co KG
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Filing: 1964-11-24
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Granted: 1969-02-04
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Expires: 1984-11-24
Abstract
No abstract record available.
Inventors
- 👤 Hans Kletschke
- 👤 Hans Macholdt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 14:59
CPC Classifications
E; E05; E05D; E05D7/00; E05D7/12; B; B65; B65G; B65G53/00; B65G53/34; B65G53/40; B65G53/48; D; D21; D21B; D21B1/00; D21B1/04; D21B1/06; B65G2812/00; B65G2812/16; B65G2812/1608; B65G2812/1616; B65G2812/1625; E05Y; E05Y2800/00; E05Y2800/26
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
97 words
APPARATUS FOR CONVEYING A MASS OF MATERIAL BETWEEN TWO REGIONS OF DIFFERENT PRESSURE WHICH COMPRISES A HOUSING HAVING A CHAMBER THEREIN, A PAIR OF ROTATABLE SHAFTS WITH INTERFOLDED SCREW THREADS THEREON, THE THREADS OF EACH SHAFT BEING INTERRUPTED TO FORM ADJACENT SMOOTH PORTIONS HAVING DIAMETERS LESS THAN THE PERIPHERAL DIAMETERS OF THE THREADED PORTIONS AND LENGTHS IN THE RANGE OF ABOUT 0.5 TO 5 TIMES THE SAID PERIPHERAL DIAMETERS, THE WALL OF SAID CHAMBER BEING SOLID AND INPERFORATE THROUGHOUT THE LENGTH THEREOF AND DISPOSED IMMEDIATELY RADIALLY OUTWARDLY OF AND ADJACENT THE OUTER PERIPHERY OF SAID THREADS AND
Claim 2
Dependent Claim
97 words
APPARATUS FOR CONVEYING A MASS OF MATERIAL BETWEEN TWO REGIONS OF DIFFERENT PRESSURE WHICH COMPRISES A HOUSING HAVING A CHAMBER THEREIN, A PAIR OF ROTATABLE SHAFTS WITH INTERFOLDED SCREW THREADS THEREON, THE THREADS OF EACH SHAFT BEING INTERRUPTED TO FORM ADJACENT SMOOTH PORTIONS HAVING DIAMETERS LESS THAN THE PERIPHERAL DIAMETERS OF THE THREADED PORTIONS AND LENGTHS IN THE RANGE OF ABOUT 0.5 TO 5 TIMES THE SAID PERIPHERAL DIAMETERS, THE WALL OF SAID CHAMBER BEING SOLID AND INPERFORATE THROUGHOUT THE LENGTH THEREOF AND DISPOSED IMMEDIATELY RADIALLY OUTWARDLY OF AND ADJACENT THE OUTER PERIPHERY OF SAID THREADS AND
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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) | 1972-02-04 | 1972-08-05 | 1973-02-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-02-04 | 1976-08-05 | 1977-02-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-02-04 | 1980-08-05 | 1981-02-04 | $7700.00 | Window Closed / Lapsed |