Patent US3795135A successfully refreshed from Google Patents.
US3795135A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sampler of air-borne particles
Assignee: 2000 Inc
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Filing: 1972-11-07
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Granted: 1974-03-05
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Expires: 1992-11-07
Abstract
Abstract An apparatus adapted to extract minute particles from a gas and deposit them on surface means for inspection and analysis and comprises a plurality of stacked perforated discs held firmly in position by retainer means and spaced apart by ring means, and air inlet and outlet means, vacuum pump attachment means for attaching a vacuum pump to draw air or other gases through the device, with the perforations in the discs in alternating positions in relation to the perforations next below and above. The apparatus of this invention is so constructed as to be easily assembled and disassembled and inexpensive to manufacture.
Inventors
- 👤 A Andersen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 11:56
CPC Classifications
G; G01; G01N; G01N1/00; G01N1/02; G01N1/22; G01N1/2202; G01N2001/222; G01N2001/2223
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
201 words
An apparatus for extracting air borne particles from gases and the like and depositing them on plate means comprising a closed elongated container comprising a base anc casing removeable from each other with an inlet and outlet adjacent oppositeends thereof, a plurality of removeable transverse perforated plate means disposed therein having small holes therein for passing gas therethrough at progressively increasing velocities from said inlet to said outlet to deposit particles of progressively decreasing size on said plate means in a direction away from said inlet, said small holes on adjacent plate means being out of alignment with each other and of progressively decreasing size in a direction away from said inlet to cause the gas to change direction as it passes through one plate means to the next, at approximately a 90 degree turn, removable spacer means comprising rings disposed between said plate means and sealing the outer edge of said plate so said gas cannot reverse flow in a 180 degree direction and, wherein the flow of said gas from the inlet to the outlet of said container is of sufficient magnitude that particles of decreasing size are progressively deposited on each succeeding plate means away from said inlet.
Claim 2
Independent Claim
201 words
An apparatus for extracting air borne particles from gases and the like and depositing them on plate means comprising a closed elongated container comprising a base anc casing removeable from each other with an inlet and outlet adjacent oppositeends thereof, a plurality of removeable transverse perforated plate means disposed therein having small holes therein for passing gas therethrough at progressively increasing velocities from said inlet to said outlet to deposit particles of progressively decreasing size on said plate means in a direction away from said inlet, said small holes on adjacent plate means being out of alignment with each other and of progressively decreasing size in a direction away from said inlet to cause the gas to change direction as it passes through one plate means to the next, at approximately a 90 degree turn, removable spacer means comprising rings disposed between said plate means and sealing the outer edge of said plate so said gas cannot reverse flow in a 180 degree direction and, wherein the flow of said gas from the inlet to the outlet of said container is of sufficient magnitude that particles of decreasing size are progressively deposited on each succeeding plate means away from said inlet.
Claim 3
Dependent Claim
28 words
The apparatus of claim 1 wherein said small holes are disposed in concentric circles about said plate means, and alternate plate means have circles with the same diameter.
Claim 4
Dependent Claim
22 words
The apparatus of claim 1 wherein said inlet and outlet are of restricted configuration and of substantially small diameter than said discs.
References Cited (Backward Citations)
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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) | 1977-03-04 | 1977-09-03 | 1978-03-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-03-04 | 1981-09-03 | 1982-03-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-03-04 | 1985-09-03 | 1986-03-05 | $7700.00 | Window Closed / Lapsed |