US3617008A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Refining apparatus, chiefly for screening paper pulp
Assignee: Kadant Lamort SAS
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Filing: 1968-07-25
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Granted: 1971-11-02
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Expires: 1988-07-25
Abstract
Abstract A perforated screen associated with the conventional blades the movement of which over the screen removes the impurities collecting on the perforations. To reduce the component of the speed of the fluid in parallel with the surface of the screen, hindrances constituted by parallel recesses or by parallel blades are provided in substantial parallelism with the blades across the screen surface facing the blades; said hindrances may be continuous or arranged in staggered formation.
Inventors
- 👤 Pierre Lamort
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 03:06
CPC Classifications
D; D21; D21D; D21D5/00; D21D5/02; D21D5/023; D21D5/026
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
43 words
In an apparatus as defined in claim 1, wherein said first means comprise at least one blade with a profile of hydrodynamic configuration mounted proximal to said one side of said screen for movement in a plane substantially parallel to said one side.
Claim 2
Dependent Claim
19 words
In an apparatus as defined in claim 1, wherein said one side is said upstream side of said screen.
Claim 3
Dependent Claim
19 words
In an apparatus as defined in claim 1, wherein said one side is said downstream side of said screen.
Claim 4
Dependent Claim
32 words
In an apparatus as defined in claim 1, wherein said second means comprises a plurality of spaced elongated recesses provided in said one side of said screen in parallelism with one another.
Claim 5
Dependent Claim
29 words
In an apparatus as defined in claim 1, wherein said second means comprises a plurality of spaceD elongated parallel bars rigid with said screen at said one side thereof.
Claim 6
Dependent Claim
28 words
In an apparatus as defined in claim 1, said second means comprising a plurality of discrete elements distributed in staggered formation over said one side of said screen.
Claim 7
Dependent Claim
90 words
In an apparatus as defined in claim 3, said first means comprising at least one blade mounted proximal to said one side of said screen for movement substantially parallel to said one side, and said second means comprising a plurality of elongated bars rigid with said one side extending transversely of said secondary component of movement and having respective cutting edges close to said blade so that solid impurities which adhere to the leading edge of said blade are severed when said leading edge moves past the respective cutting edges.
Claim 8
Dependent Claim
60 words
In an apparatus as defined in claim 1, wherein said perforations are constituted by a plurality of substantially parallel slots for passage of the liquid therethrough, and wherein said second means comprise a plurality of elongated elements extending transversely of said slots at the ends of the same which trail in the direction of said primary component of said stream.
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) | 1974-11-01 | 1975-05-03 | 1975-11-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-01 | 1979-05-03 | 1979-11-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-01 | 1983-05-03 | 1983-11-02 | $7700.00 | Window Closed / Lapsed |