Patent US3048349A successfully refreshed from Google Patents.
Patent US5059324A successfully refreshed from Google Patents.
US5059324A
Expired / Lapsed
US
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Centrifugal pulp screen
Assignee: Individual
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Filing: 1990-11-15
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Granted: 1991-10-22
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Expires: 2010-11-15
Abstract
Abstract A cylindrical screen member of a centrifugal pulp screen used in paper manufacturing is disclosed. The pulp is agitated and impelled to pass through a plurality of parallel radial through-holes of the screen member by the centrifugal force imparted by a rotor. Each through-hole of the screen member has a cross-section elongated in a direction transverse to a horizontal line and inclined at an angle with respect to a vertical line. The pulp particles can linearly pass through the through-holes and flow out through the screen member smoothly. Therefore, the likelihood of blockage is reduced, and the power necessary to drive the rotor is economized.
Inventors
- 👤 Tzau-Ha Chen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 21:12
CPC Classifications
D; D21; D21D; D21D5/00; D21D5/02; D21D5/16; B; B01; B01D; B01D29/00; B01D29/11; B01D29/31; B01D29/35; B01D29/356; B01D29/76; B01D29/86; B01D29/88; B01D29/94; B01D29/945; B07; B07B; B07B1/00; B07B1/18; B07B1/20
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
99 words
A centrifugal pulp screen including a vertical rotor, a cylindrical screen member around said rotor, said cylindrical screen member having a plurality of parallel radial through-holes located in separate parallel tiers, each of said through-holes has an inner end, an outer end, a constricted intermediate portion, and a cross-section elongated in a direction transverse to a horizontal line and inclined at an angle with respect to a vertical line, each of said through-holes further having a lower end and an upper end, said lower end leading said upper end with respect to the direction of rotation of said rotor.
Claim 2
Dependent Claim
99 words
A centrifugal pulp screen including a vertical rotor, a cylindrical screen member around said rotor, said cylindrical screen member having a plurality of parallel radial through-holes located in separate parallel tiers, each of said through-holes has an inner end, an outer end, a constricted intermediate portion, and a cross-section elongated in a direction transverse to a horizontal line and inclined at an angle with respect to a vertical line, each of said through-holes further having a lower end and an upper end, said lower end leading said upper end with respect to the direction of rotation of said rotor.
Claim 3
Dependent Claim
27 words
A centrifugal pulp screen as claimed in claim 1, wherein each of said radial through-holes gradually diverges from said constricted intermediate portion to said outer open end.
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) | 1994-10-21 | 1995-04-22 | 1995-10-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-10-21 | 1999-04-22 | 1999-10-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-10-21 | 2003-04-22 | 2003-10-22 | $7700.00 | Window Closed / Lapsed |