Patent US4939442A successfully refreshed from Google Patents.
Patent US3698649A successfully refreshed from Google Patents.
US3698649A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Screening apparatus
Assignee: Black Clawson Co
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Filing: 1970-12-18
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Granted: 1972-10-17
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Expires: 1990-12-18
Abstract
Abstract Screening and defibering apparatus which includes a chamber which is preferably, but not necessarily, rectangular in cross section, and which is subdivided into a central intake section and outwardly disposed outlet sections by a pair of spaced, parallel, foraminous walls. A slurry of the material to be treated is passed through an intake line into the intake section where it is subjected to mechanical and hydraulic shear forces by a pair of rotors, each of which is rotatably mounted in the intake section in closely spaced relationship to one of the foraminous walls. Accepted portions of the slurry pass through perforations in the foraminous walls into the outlet sections for removal through outlet lines while rejected material is bled from the intake chamber, either periodically or continuously, through a reject line. A rinse line may also be utilized, feeding into the intake chamber, to assist in purging the system.
Inventors
- 👤 William Herbert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 16:30
CPC Classifications
D; D21; D21B; D21B1/00; D21B1/04; D21B1/12; D21B1/30; D21B1/32; D21D; D21D5/00; D21D5/02; D21D5/04; Y; Y02; Y02W; Y02W30/00; Y02W30/50; Y02W30/64
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
99 words
Apparatus of the type described comprising: a. means defining a substantially enclosed chamber, b. foraminous wall means mounted in said chamber and dividing said chamber into intake and outlet sections, c. said intake and outlet sections communicating through said foraminous wall means, d. rotor means rotatably mounted in said intake section in closely spaced relationship to said foraminous wall means, e. inlet and accepts outlet defining means into and from said intake and outlet sections, respectively, f. means defining a reject outlet from said intake section of said chambers, and g. means for opening and closing said reject outlet.
Claim 2
Dependent Claim
99 words
Apparatus of the type described comprising: a. means defining a substantially enclosed chamber, b. foraminous wall means mounted in said chamber and dividing said chamber into intake and outlet sections, c. said intake and outlet sections communicating through said foraminous wall means, d. rotor means rotatably mounted in said intake section in closely spaced relationship to said foraminous wall means, e. inlet and accepts outlet defining means into and from said intake and outlet sections, respectively, f. means defining a reject outlet from said intake section of said chambers, and g. means for opening and closing said reject outlet.
Claim 3
Dependent Claim
43 words
The apparatus of claim 1 comprising: a. a drive shaft extending through said chamber, b. said rotor means being mounted on said drive shaft, and c. means positioned outwardly of said chamber and journaling end portions of said drive shaft for rotation thereof.
Claim 4
Dependent Claim
45 words
The apparatus of claim 1 wherein each of said rotor means comprises: a. a central hub portion, and b. a plurality of rotor arms attached to and extending outwardly from said hub portion, c. each of said rotor arms having a substantially planar leading edge.
Claim 5
Dependent Claim
16 words
The apparatus of claim 3 wherein: a. said intake section is substantially rectangular in cross section.
Claim 6
Dependent Claim
180 words
Screening apparatus comprising: a. a substantially enclosed chamber including pairs of opposed, parallel front and back, top and bottom and end walls, b. a pair of foraminous walls extending in spaced parallel relationship to said end walls and defining therebetween a centrally disposed inlet section, and with said end walls, a pair of outlet sections communicating with said inlet sections through said foraminous walls, c. a drive shaft extending through said end and foraminous walls and journalled outwardly of said outlet sections, d. a pair of rotors each including a central hub and outwardly projecting arms have substantIally planar leading edges mounted on said shaft within said inlet chamber and in overlying relationship to said foraminous walls, e. an inlet line having a valve member therein communicating with said inlet chamber, f. a rinse line having a valve member therein communicating with said inlet line intermediate said inlet chamber and said inlet line valve, g. a reject line having a valve member therein communicating with said inlet chamber, and h. an outlet line communicating with each of said outlet chambers.
Claim 7
Dependent Claim
180 words
Screening apparatus comprising: a. a substantially enclosed chamber including pairs of opposed, parallel front and back, top and bottom and end walls, b. a pair of foraminous walls extending in spaced parallel relationship to said end walls and defining therebetween a centrally disposed inlet section, and with said end walls, a pair of outlet sections communicating with said inlet sections through said foraminous walls, c. a drive shaft extending through said end and foraminous walls and journalled outwardly of said outlet sections, d. a pair of rotors each including a central hub and outwardly projecting arms have substantIally planar leading edges mounted on said shaft within said inlet chamber and in overlying relationship to said foraminous walls, e. an inlet line having a valve member therein communicating with said inlet chamber, f. a rinse line having a valve member therein communicating with said inlet line intermediate said inlet chamber and said inlet line valve, g. a reject line having a valve member therein communicating with said inlet chamber, and h. an outlet line communicating with each of said outlet chambers.
Claim 8
Dependent Claim
20 words
The apparatus of claim 1 further comprising: a. a rinse line including control means therefor connected with said inlet means.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-10-17 | 1976-04-17 | 1976-10-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-17 | 1980-04-17 | 1980-10-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-17 | 1984-04-17 | 1984-10-17 | $7700.00 | Window Closed / Lapsed |