US4288288A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for mixing chemicals into pulp at a refiner inlet
Assignee: Weyerhaeuser Co
•
Filing: 1979-06-15
•
Granted: 1981-09-08
•
Expires: 1999-06-15
Abstract
Abstract A design of a distribution unit allowing a gas or other material to be uniformly supplied to a mixing device close to the point of mixing. The distribution unit can be used for mixing chemicals into pulp at a refiner inlet.
Inventors
- 👤 John A. Fleck
- 👤 Michael D. Meredith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 18:45
CPC Classifications
D; D21; D21D; D21D1/00; D21D1/20; D21D1/30; D21B; D21B1/00; D21B1/04; D21B1/12; D21B1/14; D21B1/16
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
115 words
Apparatus for mixing chemicals with pulp comprising a casing, a refiner section in said casing, a pair of opposed refiner plates in said refiner section rotatably movable with respect to each other, an inlet to said refiner section, said inlet having an inner wall, an outlet in said casing, a sleeve extending along the inner wall of said inlet, said sleeve having a wall with inner and outer surfaces, a plurality of parallel tubes oriented axially and distributed radially around the axis of said inlet and being part of said sleeve, means for holding said sleeve in position in said inlet, means associated with said tubes for providing chemicals through said tubes to the pulp.
Claim 2
Dependent Claim
115 words
Apparatus for mixing chemicals with pulp comprising a casing, a refiner section in said casing, a pair of opposed refiner plates in said refiner section rotatably movable with respect to each other, an inlet to said refiner section, said inlet having an inner wall, an outlet in said casing, a sleeve extending along the inner wall of said inlet, said sleeve having a wall with inner and outer surfaces, a plurality of parallel tubes oriented axially and distributed radially around the axis of said inlet and being part of said sleeve, means for holding said sleeve in position in said inlet, means associated with said tubes for providing chemicals through said tubes to the pulp.
Claim 3
Dependent Claim
27 words
The apparatus of claim 1 further comprising said tubes being attached to the inner wall of said sleeve, said sleeve lining the inner wall of said inlet.
Claim 4
Dependent Claim
48 words
The apparatus of claim 2 further comprising a flange attached to said sleeve, and each of said tubes being connected to a second tube, said second tubes extending radially along said flange, said chemical provision means providing chemicals to said pulp through said second tubes and said tubes.
Claim 5
Dependent Claim
15 words
The apparatus of claim 3 further comprising said second tubes being recessed within said flange.
Claim 6
Dependent Claim
18 words
The apparatus of claim 4 further comprising said tubes being recessed within the inner wall of said sleeve.
Claim 7
Dependent Claim
17 words
The apparatus of claim 3 further comprising said second tubes being within and formed by said flange.
Claim 8
Dependent Claim
28 words
The apparatus of claim 1 further comprising said tubes being attached to the outer wall of said sleeve, said tubes being along the inner wall of said inlet.
Claim 9
Dependent Claim
48 words
The apparatus of claim 7 further comprising a flange attached to said sleeve, and each of said tubes being connected to a second tube, said second tubes extending radially along said flange, said chemical provision means providing chemicals to said pulp through said second tubes and said tubes.
Claim 10
Dependent Claim
15 words
The apparatus of claim 8 further comprising said second tubes being recessed within said flange.
Claim 11
Dependent Claim
18 words
The apparatus of claim 9 further comprising said tubes being recessed within the outer wall of said sleeve.
Claim 12
Dependent Claim
17 words
The apparatus of claim 8 further comprising said second tubes being within and formed by said flange.
Claim 13
Dependent Claim
19 words
The apparatus of claim 1 further comprising said tubes being within and formed by the wall of said sleeve.
Claim 14
Dependent Claim
56 words
The apparatus of claim 12 further comprising a flange attached to said sleeve, and each of said tubes being connected to a second tube, said second tubes extending radially through said flange, and being within and formed by said flange, said chemical provision means providing chemicals to said pulp through said second tubes and said tubes.
Claim 15
Dependent Claim
17 words
The apparatus of claim 1 further comprising said tubes being recessed within the wall of said sleeve.
Claim 16
Dependent Claim
48 words
The apparatus of claim 14 further comprising a flange attached to said sleeve, and each of said tubes being connected to a second tube, said second tubes extending radially along said flange, said chemical provision means providing chemicals to said pulp through said second tubes and said tubes.
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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) | 1984-09-07 | 1985-03-09 | 1985-09-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-09-07 | 1989-03-09 | 1989-09-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-09-07 | 1993-03-09 | 1993-09-08 | $7700.00 | Window Closed / Lapsed |