Patent US4285285A successfully refreshed from Google Patents.
Patent US4055076A successfully refreshed from Google Patents.
US4055076A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Centrifugal granulometer
Assignee: Individual
•
Filing: 1976-03-22
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Granted: 1977-10-25
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Expires: 1996-03-22
Abstract
Abstract A centrifugal granulometer comprises a hollow circular horizontal plate that is driven in rotation about its vertical axis and that has a transparent peripheral zone. Particulate material is introduced into the interior of the plate at a predetermined distance radially inward of the periphery of the plate, where it becomes suspended in a liquid. Upon rotation of the plate, the particles migrate through the liquid radially outwardly in dependence on their mass and size. A light beam passing through the translucent peripheral portion is transmitted to a photoelectric receiver with an intensity that varies inversely as the concentration of particles in the peripheral zone. The plot of transmitted light versus time gives information as to the quantity and distribution of the particles according to size and weight.
Inventors
- 👤 Michele Tropea
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 06:09
CPC Classifications
G; G01; G01N; G01N15/00; G01N15/04; G01N15/042
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
146 words
A centrifugal granulometer comprising a centrifugal rotor in the form of a hollow disc, means mounting said disc for rotation about a vertical axis, means for rotating said disc about said vertical axis, a cone mounted for rotation coaxially with said disc, the base of the cone comprising the radially inner edge of a single flat continuous annular chamber within said disc, the disc having a single translucent continuous annular peripheral zone, means to project a light beam through said translucent zone, and photoelectric means to determine and record the intensity of said beam which has passed through said zone as a function of time, said cone comprising the inner wall of a frusto-conical feed passage for a specimen whose granulometry is to be determined, the lower edge of said feed passage opening into the inner edge of said annular chamber entirely about said inner edge.
Claim 2
Dependent Claim
146 words
A centrifugal granulometer comprising a centrifugal rotor in the form of a hollow disc, means mounting said disc for rotation about a vertical axis, means for rotating said disc about said vertical axis, a cone mounted for rotation coaxially with said disc, the base of the cone comprising the radially inner edge of a single flat continuous annular chamber within said disc, the disc having a single translucent continuous annular peripheral zone, means to project a light beam through said translucent zone, and photoelectric means to determine and record the intensity of said beam which has passed through said zone as a function of time, said cone comprising the inner wall of a frusto-conical feed passage for a specimen whose granulometry is to be determined, the lower edge of said feed passage opening into the inner edge of said annular chamber entirely about said inner edge.
Claim 3
Dependent Claim
23 words
A granulometer as claimed in claim 1, the path of said light beam being parallel to the axis of rotation of said disc.
Claim 4
Dependent Claim
24 words
A granulometer as claimed in claim 1, said rotating means comprising a motor, and means to vary the speed of rotation of said motor.
Claim 5
Dependent Claim
23 words
A granulometer as claimed in claim 1, said motor having a vertical drive shaft to which said disc and cone are concentrically secured.
Claim 6
Dependent Claim
35 words
A granulometer as claimed in claim 1, said means to project a light beam through said translucent zone and said photoelectric means being both fixed, with said disc rotating relative to them and between them.
Claim 7
Dependent Claim
120 words
A centrifugal granulometer comprising a centrifugal rotor in the form of a hollow disc, means mounting said disc for rotation about a vertical axis, means for rotating said disc about said vertical axis, a cone mounted for rotation coaxially with said disc, the base of the cone comprising the radially inner edge of a flat annular chamber within said disc, the disc having a translucent peripheral zone, means to project a light beam through said translucent zone, photoelectric means to determine and record the intensity of said beam which has passed through said zone as a function of time, and at least one valve at the periphery of the disc for the discharge of a specimen that has undergone analysis.
Claim 8
Dependent Claim
120 words
A centrifugal granulometer comprising a centrifugal rotor in the form of a hollow disc, means mounting said disc for rotation about a vertical axis, means for rotating said disc about said vertical axis, a cone mounted for rotation coaxially with said disc, the base of the cone comprising the radially inner edge of a flat annular chamber within said disc, the disc having a translucent peripheral zone, means to project a light beam through said translucent zone, photoelectric means to determine and record the intensity of said beam which has passed through said zone as a function of time, and at least one valve at the periphery of the disc for the discharge of a specimen that has undergone analysis.
Claim 9
Dependent Claim
19 words
A granulometer as claimed in claim 6, there being a diametrically opposed pair of said valves on said disc.
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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) | 1980-10-24 | 1981-04-25 | 1981-10-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-10-24 | 1985-04-25 | 1985-10-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-10-24 | 1989-04-25 | 1989-10-25 | $7700.00 | Window Closed / Lapsed |