Patent US3681973A successfully refreshed from Google Patents.
US3681973A
Expired / Lapsed
US
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Centrifugal rotating particle sizing apparatus
Assignee: Calspan Corp
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Filing: 1971-02-18
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Granted: 1972-08-08
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Expires: 1991-02-18
Abstract
Abstract A particle sizing apparatus comprising a sampler mounted for rotation in a plane perpendicular to the wind direction having an entrance slot communicating with a hollow aerodynamically shaped chamber, the outer surface of which has a collection paper for collecting the particles along the length thereof as they impinge thereagainst at various points determined by the trajectories the particles follow once they are within the chamber.
Inventors
- 👤 Gary R Ludwig
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 05:06
CPC Classifications
G; G01; G01N; G01N15/00; G01N15/04; G01N15/042
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
48 words
Aerosol sampling apparatus, comprising: a. a substantially aerodynamically shaped member having a hollow interior chamber, b. entrance opening means communicating with said hollow interior chamber for collecting aerosol particles, and c. means for rotating said sampler in a plane substantially perpendicular to the direction of local wind speed.
Claim 2
Dependent Claim
48 words
Aerosol sampling apparatus, comprising: a. a substantially aerodynamically shaped member having a hollow interior chamber, b. entrance opening means communicating with said hollow interior chamber for collecting aerosol particles, and c. means for rotating said sampler in a plane substantially perpendicular to the direction of local wind speed.
Claim 3
Dependent Claim
25 words
The apparatus according to claim 1, further comprising, d. means on an outer surface of said interior chamber for collecting particles along the extent thereof.
Claim 4
Dependent Claim
37 words
The apparatus according to claim 2, wherein; e. said outer surface is curved and diverges away from said entrance opening means whereby the particles upon entering said chamber separate and follow trajectories according to the sizes thereof.
Claim 5
Dependent Claim
20 words
The apparatus according to claim 3, wherein; f. said means on an outer surface of said chamber is removable therefrom.
Claim 6
Dependent Claim
15 words
The apparatus according to claim 4, further comprising; g. motor means for rotating said sampler.
Claim 7
Dependent Claim
23 words
The apparatus according to claim 5, further comprising; h. means for aligning said sampler in a plane perpendicular to the local wind vector.
Claim 8
Dependent Claim
15 words
The apparatus according to claim 6, wherein; i. said means for aligning comprises a vane.
Claim 9
Dependent Claim
57 words
The apparatus according to claim 1, further comprising; d. adhesive means on an outer surface of said chamber for collecting particles along the extent thereof, and wherein; e. said outer surface is curved and diverges away from said entrance opening means whereby the particles upon entering said chamber separate and follow trajectories according to the sizes thereof.
Claim 10
Dependent Claim
15 words
The apparatus according to claim 1, wherein; d. said entrance opening means comprises a slit.
Claim 11
Dependent Claim
26 words
The apparatus according to claim 8, further comprising; e. removable means on said outer surface of said interior chamber for collecting particles along the extent thereof.
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) | 1975-08-08 | 1976-02-07 | 1976-08-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-08 | 1980-02-07 | 1980-08-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-08 | 1984-02-07 | 1984-08-08 | $7700.00 | Window Closed / Lapsed |