Patent US4023737A successfully refreshed from Google Patents.
US4023737A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Spiral groove pattern refiner plates
Assignee: Westvaco Corp
•
Filing: 1976-03-23
•
Granted: 1977-05-17
•
Expires: 1996-03-23
Abstract
Abstract The bar and channel pattern of a disc refiner plate follows the curve of a continuous circular arc from the stock distribution ring groove to the outer plate periphery. Each channel is of constant sectional flow area to provide uniform flow area into and out of the refiner section.
Inventors
- 👤 Philip J. Leider
- 👤 Jorg Rihs
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 12:11
CPC Classifications
B; B02; B02C; B02C7/00; B02C7/11; B02C7/12
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
136 words
A pie segment of a fibrous stock refiner disc fabricated about an axis of revolution and having a serrated stock working face on one planar surface thereof, said face having a stock distribution groove segment of a circular ring developed about said axis and disposed radially between said axis and an outer peripherial boundary of said disc segment, serrations between said distribution groove and said outer boundary comprising an alternating series of curved bars and channels extending continuously from said groove to said outer boundary, each bar having substantially the same thickness at said groove as at said boundary and each channel being a substantially constant width arc of a first circle developed about a first center point located on the locus of a second circle, said second circle being developed about said axis of revolution.
Claim 2
Dependent Claim
136 words
A pie segment of a fibrous stock refiner disc fabricated about an axis of revolution and having a serrated stock working face on one planar surface thereof, said face having a stock distribution groove segment of a circular ring developed about said axis and disposed radially between said axis and an outer peripherial boundary of said disc segment, serrations between said distribution groove and said outer boundary comprising an alternating series of curved bars and channels extending continuously from said groove to said outer boundary, each bar having substantially the same thickness at said groove as at said boundary and each channel being a substantially constant width arc of a first circle developed about a first center point located on the locus of a second circle, said second circle being developed about said axis of revolution.
Claim 3
Dependent Claim
39 words
A refiner disc segment as described by claim 1 wherein said center point of each channel is positioned at the intersection of said second circle locus and a bisector of the first circle arc corresponding to an adjacent channel.
Claim 4
Dependent Claim
23 words
A refiner disc segment as described by claim 2 wherein said second circle is radially disposed between said groove and said outer boundary.
Claim 5
Dependent Claim
120 words
A fibrous stock refining disc fabricated about an axis of revolution and having a stock refining face on one planar surface thereof, said face having a circular stock distribution groove developed about said axis and disposed radially between said axis and an outer peripherial boundary of said disc, said refining face comprising an alternating series of curved ridges and channels extending continuously from said groove to said outer boundary, each ridge having substantially the same thickness at said groove as at said boundary and each channel being a substantially constant width arc of a first circle developed about a first center point located on the locus of a second circle, said second circle being developed about said axis of revolution.
Claim 6
Dependent Claim
120 words
A fibrous stock refining disc fabricated about an axis of revolution and having a stock refining face on one planar surface thereof, said face having a circular stock distribution groove developed about said axis and disposed radially between said axis and an outer peripherial boundary of said disc, said refining face comprising an alternating series of curved ridges and channels extending continuously from said groove to said outer boundary, each ridge having substantially the same thickness at said groove as at said boundary and each channel being a substantially constant width arc of a first circle developed about a first center point located on the locus of a second circle, said second circle being developed about said axis of revolution.
Claim 7
Dependent Claim
38 words
A refining disc as described by claim 4 wherein said center point of each channel is positioned at the intersection of said second circle locus and a bisector of said first circle arc corresponding to an adjacent channel.
Claim 8
Dependent Claim
22 words
A refining disc as described by claim 5 wherein said second circle is radially disposed between said groove and said outer boundary.
Claim 9
Dependent Claim
20 words
A refining disc as described by claim 4 wherein said disc is radially divided into a plurality of circle sectors.
Claim 10
Dependent Claim
47 words
A refining disc as described by claim 4 wherein a radius from said center point to an intersecting point of a corresponding channel arc with said groove is normal to a radius between said axis and said intersecting point of said corresponding channel arc with said groove.
References Cited (Backward Citations)
US4382A
Cited
US1609717A
Cited
US727156A
Cited
US2356753A
Cited
US2912174A
Cited
DE1020516B
Cited
US3674217A
Cited
US3910511A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-05-16 | 1980-11-15 | 1981-05-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-05-16 | 1984-11-15 | 1985-05-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-05-16 | 1988-11-15 | 1989-05-17 | $7700.00 | Window Closed / Lapsed |