Patent US3141337A successfully refreshed from Google Patents.
US3141337A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Particle size analyzer
Assignee: Douglas Aircraft Co Inc
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Filing: 1961-05-03
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Granted: 1964-07-21
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Expires: 1981-05-03
Abstract
No abstract record available.
Inventors
- 👤 Bo N Hoffstrom
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 23:10
CPC Classifications
G; G01; G01N; G01N15/00; G01N15/02; G01N15/0255
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
142 words
APPARATUS FOR ANALYZING THE SIZE OF PARTICLES IN A GIVEN SAMPLE COMPRISING A ROTOR FORMING A LONGITUDINALLY EXTENDING CHANNEL HAVING OPPOSED WALLS, MEANS FOR ROTATING SAID ROTOR AND ESTABLISHING A STREAM OF FLUID FLOWING AXIALLY THROUGH SAID CHANNEL, SAID FLUID MOVING AT ESSENTIALLY THE SAME CIRCUMFERENTIAL VELOCITY AS SAID ROTOR, MEANS FOR INJECTING SAID PARTICLES INTO SAID CHANNEL THROUGH ONE WALL THEREOF TRANSVERSELY OF SAID CHANNEL INTERMEDIATE THE ENDS OF SAID CHANNEL WITH ESSENTIALLY THE SAME ROTARY VELOCITY AS SAID FLUID AND WITH SUFFICIENT RADIAL VELOCITY TO CAUSE SAID PARTICLES TO IMPINGE ON THE OPPOSITE WALL OF SAID CHANNEL WHEREBY THE COARSE PARTICLES WILL BE MOVED A PREDETERMINED DISTANCE AXIALLY OF SAID CHANNEL BY SAID STREAM OF FLUID AND THE FINER PARTICLES WILL BE MOVED A GREATER DISTANCE AXIALLY OF SAID CHANNEL FOR DEPOSIT ON SAID OPPOSITE WALL AT AXIALLY SPACED LOCATIONS.
Claim 2
Dependent Claim
142 words
APPARATUS FOR ANALYZING THE SIZE OF PARTICLES IN A GIVEN SAMPLE COMPRISING A ROTOR FORMING A LONGITUDINALLY EXTENDING CHANNEL HAVING OPPOSED WALLS, MEANS FOR ROTATING SAID ROTOR AND ESTABLISHING A STREAM OF FLUID FLOWING AXIALLY THROUGH SAID CHANNEL, SAID FLUID MOVING AT ESSENTIALLY THE SAME CIRCUMFERENTIAL VELOCITY AS SAID ROTOR, MEANS FOR INJECTING SAID PARTICLES INTO SAID CHANNEL THROUGH ONE WALL THEREOF TRANSVERSELY OF SAID CHANNEL INTERMEDIATE THE ENDS OF SAID CHANNEL WITH ESSENTIALLY THE SAME ROTARY VELOCITY AS SAID FLUID AND WITH SUFFICIENT RADIAL VELOCITY TO CAUSE SAID PARTICLES TO IMPINGE ON THE OPPOSITE WALL OF SAID CHANNEL WHEREBY THE COARSE PARTICLES WILL BE MOVED A PREDETERMINED DISTANCE AXIALLY OF SAID CHANNEL BY SAID STREAM OF FLUID AND THE FINER PARTICLES WILL BE MOVED A GREATER DISTANCE AXIALLY OF SAID CHANNEL FOR DEPOSIT ON SAID OPPOSITE WALL AT AXIALLY SPACED LOCATIONS.
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) | 1967-07-21 | 1968-01-20 | 1968-07-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-07-21 | 1972-01-20 | 1972-07-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-07-21 | 1976-01-20 | 1976-07-21 | $7700.00 | Window Closed / Lapsed |