Patent US2741954A successfully refreshed from Google Patents.
US2741954A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Refining paper pulp
Assignee: Black Clawson Co
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Filing: 1954-01-20
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Granted: 1956-04-17
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Expires: 1974-01-20
Abstract
No abstract record available.
Inventors
- 👤 Allibe Aime Louis Henri
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 20:01
CPC Classifications
D; D21; D21D; D21D1/00; D21D1/20; D21D1/22
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
102 words
AN APPARATUS FOR REFINING PAPER PULP COMPRISING A CONCIAL REFINING CHAMBER, A PERFORATED FRUSTO-CONICAL STATOR MOUNTED IN SAID CHAMBER, THE PERFORATED WALL OF THE STATOR BEING SPACED FROM THE CHAMBER WALL, A FRUSTOCONICAL ROTOR HAVING PERFORATED BLADES JOURNALLED INSIDE THE STATOR, THE ROTOR BLADES HAVING A SPIRALLY SHAPED CROSS SECTION, AN INLET OPENING FOR THE PAPER PULP AT ONE END OF THE CHAMBER, MEANS FOR ADJUSTING THE RELATIVE POSITIONS OF THE STATOR AND ROTOR LENGTHWISE OF THE CHAMBER SO AS TO PROVIDE BETWEEN THE ROTOR AND STATOR A GAP FOR THE FLOW OF THE PULP THAT HAS PASSED THROUGH THE PERFORATED BLADES
Claim 2
Independent Claim
102 words
AN APPARATUS FOR REFINING PAPER PULP COMPRISING A CONCIAL REFINING CHAMBER, A PERFORATED FRUSTO-CONICAL STATOR MOUNTED IN SAID CHAMBER, THE PERFORATED WALL OF THE STATOR BEING SPACED FROM THE CHAMBER WALL, A FRUSTOCONICAL ROTOR HAVING PERFORATED BLADES JOURNALLED INSIDE THE STATOR, THE ROTOR BLADES HAVING A SPIRALLY SHAPED CROSS SECTION, AN INLET OPENING FOR THE PAPER PULP AT ONE END OF THE CHAMBER, MEANS FOR ADJUSTING THE RELATIVE POSITIONS OF THE STATOR AND ROTOR LENGTHWISE OF THE CHAMBER SO AS TO PROVIDE BETWEEN THE ROTOR AND STATOR A GAP FOR THE FLOW OF THE PULP THAT HAS PASSED THROUGH THE PERFORATED BLADES
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-04-17 | 1959-10-17 | 1960-04-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-04-17 | 1963-10-17 | 1964-04-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-04-17 | 1967-10-17 | 1968-04-17 | $7700.00 | Window Closed / Lapsed |