US2709397A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tubular hydro-extractor for purifying suspensions of fibrous material
Assignee: "o Dorries AG Vorm Maschinenfabrik Banning & Seybold"
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Filing: 1951-07-06
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Granted: 1955-05-31
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Expires: 1971-07-06
Abstract
No abstract record available.
Inventors
- 👤 Banning Helmuth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 00:23
CPC Classifications
D; D21; D21D; D21D5/00; D21D5/18
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
80 words
IN A TUBULAR HYDRO-EXTRACTOR FOR PURIFYING SUSPENSIONS HAVING A VERTICAL TUBE LONG RELATIVE TO ITS DIAMETER, A TANGENTIAL INLET AT THE UPPER END FOR SUSPSENSION AND A CENTRAL OUTLET FOR PURIFIED SUSPENSION, AN OUTLET FOR IMPURITIES AT THE LOWER END OF SAID TUBE, THE IMPROVEMENT WHICH COMPRISES AT LEAST ONE SUBSTANTIALLY CIRCULAR SLIT IN SAID TUBE ABOVE THE OUTLET FOR IMPURITIES AND SUBSTANTIALLY BELOW SAID INLET, AND MEANS FOR INTRODUCING A STREAM OF WATER INTO SAID TUBE THROUGH SALT SLIT.
Claim 2
Dependent Claim
80 words
IN A TUBULAR HYDRO-EXTRACTOR FOR PURIFYING SUSPENSIONS HAVING A VERTICAL TUBE LONG RELATIVE TO ITS DIAMETER, A TANGENTIAL INLET AT THE UPPER END FOR SUSPSENSION AND A CENTRAL OUTLET FOR PURIFIED SUSPENSION, AN OUTLET FOR IMPURITIES AT THE LOWER END OF SAID TUBE, THE IMPROVEMENT WHICH COMPRISES AT LEAST ONE SUBSTANTIALLY CIRCULAR SLIT IN SAID TUBE ABOVE THE OUTLET FOR IMPURITIES AND SUBSTANTIALLY BELOW SAID INLET, AND MEANS FOR INTRODUCING A STREAM OF WATER INTO SAID TUBE THROUGH SALT SLIT.
References Cited (Backward Citations)
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Cited
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Cited
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Cited
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Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-05-30 | 1958-11-29 | 1959-05-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-05-30 | 1962-11-29 | 1963-05-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-05-30 | 1966-11-29 | 1967-05-31 | $7700.00 | Window Closed / Lapsed |