US3719089A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Determination of particle size distribution
Assignee: Commonwealth Scientific and Industrial Research Organisation
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Filing: 1970-08-11
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Granted: 1973-03-06
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Expires: 1990-08-11
Abstract
Abstract In a method for determining the particle size distribution in a fluid stream wherein the concentration of one size fraction is compared with that of another, the concentration of a given fraction is determined by determining the rate of accumulation of the material of that fraction over a series of successive short time intervals.
Inventors
- 👤 D Kelsall
- 👤 C Restarick
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 03:20
CPC Classifications
G; G01; G01N; G01N15/00; G01N15/02; G01N15/0255
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
91 words
A method for the determination of the particle size distribution in a stream of particulate material which comprises separating the stream into at least two separate size fractions, measuring the rate of flow of particulate material in at least one of the size fractions by measuring the time taken to accumulate a known volume of the said particulate material of that fraction over a series of successive short time intervals and comparing the flow rate of the said size fraction with the flow rate of the stream or another fraction thereof.
Claim 2
Independent Claim
91 words
A method for the determination of the particle size distribution in a stream of particulate material which comprises separating the stream into at least two separate size fractions, measuring the rate of flow of particulate material in at least one of the size fractions by measuring the time taken to accumulate a known volume of the said particulate material of that fraction over a series of successive short time intervals and comparing the flow rate of the said size fraction with the flow rate of the stream or another fraction thereof.
Claim 3
Independent Claim
91 words
A method for the determination of the particle size distribution in a stream of particulate material which comprises separating the stream into at least two separate size fractions, measuring the rate of flow of particulate material in at least one of the size fractions by measuring the time taken to accumulate a known volume of the said particulate material of that fraction over a series of successive short time intervals and comparing the flow rate of the said size fraction with the flow rate of the stream or another fraction thereof.
Claim 4
Independent Claim
91 words
A method for the determination of the particle size distribution in a stream of particulate material which comprises separating the stream into at least two separate size fractions, measuring the rate of flow of particulate material in at least one of the size fractions by measuring the time taken to accumulate a known volume of the said particulate material of that fraction over a series of successive short time intervals and comparing the flow rate of the said size fraction with the flow rate of the stream or another fraction thereof.
Claim 5
Dependent Claim
37 words
The method of claim 1, wherein the rates of accumulation of the material of at least two size fractions is measured and each of the fractions to be measured are accumulated in chambers of the same volume.
Claim 6
Independent Claim
94 words
A method for the determination of the particle size distribution in a stream of particulate material which comprises separating the stream into at least two separate size fractions, measuring the rate of flow of particulate material in at least one of the size fractions by determining the time taken to reach a given concentration of said particulate material of that fraction in a known volume over a series of successive short time intervals and comparing the flow rate of the said size fraction with the flow rate of the stream or another fraction thereof.
Claim 7
Independent Claim
94 words
A method for the determination of the particle size distribution in a stream of particulate material which comprises separating the stream into at least two separate size fractions, measuring the rate of flow of particulate material in at least one of the size fractions by determining the time taken to reach a given concentration of said particulate material of that fraction in a known volume over a series of successive short time intervals and comparing the flow rate of the said size fraction with the flow rate of the stream or another fraction thereof.
Claim 8
Independent Claim
89 words
A method for the determination of the particle size distribution in a stream of particulate material which comprises separating the stream into at least two separate size fractions, measuring the rate of flow of particulate material in at least one of the size fractions by determining the weight of said particulate material of that fraction accumulated in a known time over a series of successive short time intervals and comparing the flow rate of the said size fraction with the flow rate of the stream or another fraction thereof.
Claim 9
Independent Claim
89 words
A method for the determination of the particle size distribution in a stream of particulate material which comprises separating the stream into at least two separate size fractions, measuring the rate of flow of particulate material in at least one of the size fractions by determining the weight of said particulate material of that fraction accumulated in a known time over a series of successive short time intervals and comparing the flow rate of the said size fraction with the flow rate of the stream or another fraction thereof.
Claim 10
Dependent Claim
82 words
Apparatus for determining the particle size distribution in a stream of particulate material comprising a separator to separate out a size fraction, accumulating means to accumulate solids separated out by one of said separators, means to detect the accumulation of a predetermined volume of solids in said accumulating means, means to measure the time taken to accumulate the said predetermined volume and means to compare the times taken for such accumulation over a series of successive accumulations of the said known volume.
Claim 11
Dependent Claim
82 words
Apparatus for determining the particle size distribution in a stream of particulate material comprising a separator to separate out a size fraction, accumulating means to accumulate solids separated out by one of said separators, means to detect the accumulation of a predetermined volume of solids in said accumulating means, means to measure the time taken to accumulate the said predetermined volume and means to compare the times taken for such accumulation over a series of successive accumulations of the said known volume.
References Cited (Backward Citations)
US2782926A
Cited
US3138029A
Cited
US3144773A
Cited
US3334516A
Cited
US3478599A
Cited
US3519353A
Cited
US3494217A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-03-05 | 1976-09-04 | 1977-03-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-05 | 1980-09-04 | 1981-03-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-05 | 1984-09-04 | 1985-03-06 | $7700.00 | Window Closed / Lapsed |