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US5076965A
Expired / Lapsed
US
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Method of generating mono dispersed aerosols for non-destructive gas mask filter testing
Assignee: United States Department of the Army
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Filing: 1990-12-31
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Granted: 1991-12-31
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Expires: 2010-12-31
Abstract
Abstract An improved process of passing an aerosol mixture through a filter. The aerosol is generated by nebulization of the mixture prior to penetration of the filter. The aerosol mixture solely being a poly-olefin having a content of chain hydrocarbon in %, by volume, of about: -% Carbon chain length -0.6 20 -82.1 30 -16.0 40 -1.0 50 -2.0 60. -
Inventors
- 👤 Mark A. Guelta
- 👤 Hugh R. Carlon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 16:13
CPC Classifications
G; G01; G01N; G01N15/00; G01N15/08; B; B01; B01D; B01D35/00; B01D2273/00; B01D2273/18; G01N2015/084
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
56 words
In an improved process of passing a prior nebulized aerosol mixture through a filter, and thereafter measuring the filter efficiency the improvement consisting essentially of said aerosol being solely a poly-alpha olefin having in %, by volume, of about: ______________________________________
% Carbon chain length
______________________________________
0.6 20
82.1 30
16.0 40
1.0 50
2.0 60.
______________________________________
Claim 2
Dependent Claim
56 words
In an improved process of passing a prior nebulized aerosol mixture through a filter, and thereafter measuring the filter efficiency the improvement consisting essentially of said aerosol being solely a poly-alpha olefin having in %, by volume, of about: ______________________________________
% Carbon chain length
______________________________________
0.6 20
82.1 30
16.0 40
1.0 50
2.0 60.
______________________________________
Claim 3
Dependent Claim
20 words
The process of claim 1 wherein the mass concentration of said aerosol at said filter is 114.9 mg/m 3 .
Claim 4
Dependent Claim
15 words
The process of claim 1 wherein said filter efficiency measuring is done by light-scattering means.
Claim 5
Dependent Claim
16 words
The process of claim 1 wherein the aerosol surface area mean diameter is about 0.203 microns.
Claim 6
Dependent Claim
13 words
The process of claim 1 wherein the aerosol spread factor is about 1.345.
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) | 1994-12-30 | 1995-07-01 | 1995-12-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-12-30 | 1999-07-01 | 1999-12-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-12-30 | 2003-07-01 | 2003-12-31 | $7700.00 | Window Closed / Lapsed |