US3942729A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for supplying treatment agent to ligno-cellulose containing material
Assignee: SCA Projekt AB
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Filing: 1973-09-05
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Granted: 1976-03-09
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Expires: 1993-09-05
Abstract
Abstract Meterial to be ground, such as ligno-cellulose containing material, is fed-in centrally between a pair of juxtaposed relatively rotatable discs. The material being ground moves outwardly towards a discharge point adjacent the periphery of the discs, and a fluidized treatment agent is supplied to the material as it is discharged from between the discs, the treatment agent issuing from an array of circumferentially spaced nozzles which surround the periphery of the discs.
Inventors
- 👤 Borje Ingemar Fredriksson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 06:36
CPC Classifications
D; D21; D21D; D21D1/00; D21D1/20; D21D1/30
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
154 words
Grinding apparatus which comprises a housing; a pair of grinding discs, adjacent to and directly in front of each other, in said housing, at least one of which discs is rotatable; the facing surfaces of which discs are capable of grinding a material; means for supplying material to be ground to a space between the grinding discs for movement outwardly from within said space through a gap between the discs, ground material exiting therefrom into the surrounding housing; and means for the separate supply of a treating agent to the ground material said means comprising a passageway system formed in at least one of the grinding discs which is rotatable, for rotation together with said disc; said passageway system being connected to supply openings located around and immediately outside the circumference of said gap between the grinding discs for supplying treating agent directly into the flow of grinding product upon exiting from said gap.
Claim 2
Dependent Claim
154 words
Grinding apparatus which comprises a housing; a pair of grinding discs, adjacent to and directly in front of each other, in said housing, at least one of which discs is rotatable; the facing surfaces of which discs are capable of grinding a material; means for supplying material to be ground to a space between the grinding discs for movement outwardly from within said space through a gap between the discs, ground material exiting therefrom into the surrounding housing; and means for the separate supply of a treating agent to the ground material said means comprising a passageway system formed in at least one of the grinding discs which is rotatable, for rotation together with said disc; said passageway system being connected to supply openings located around and immediately outside the circumference of said gap between the grinding discs for supplying treating agent directly into the flow of grinding product upon exiting from said gap.
Claim 3
Dependent Claim
40 words
Grinding apparatus as defined in claim 1, wherein the grinding disc which is provided with the passageway system projects peripherally outside of the outlet of the grinding gap, the supply openings being provided in said projecting portion of the disc.
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) | 1979-03-09 | 1979-09-08 | 1980-03-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-03-09 | 1983-09-08 | 1984-03-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-03-09 | 1987-09-08 | 1988-03-09 | $7700.00 | Window Closed / Lapsed |