US5059349A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of measuring the efficiency of gas mask filters using monodispersed aerosols
Assignee: United States Department of the Army
•
Filing: 1990-12-31
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Granted: 1991-10-22
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Expires: 2010-12-31
Abstract
Abstract An improved process of passing an aerosol mixture through a filter. The aerosol mixture solely being a poly-alpha olefin having a content of chain lengths in % by volume of about: -% Carbon atoms, chain length -0.6 20 -82.1 30 -16.0 40 -1.0 50 -2.0 60. -
Inventors
- 👤 Hugh R. Carlon
- 👤 Mark A. Guelta
- 👤 Bernard V. Gerber
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 17:32
CPC Classifications
G; G01; G01N; G01N15/00; G01N15/08; G01N15/082; G01N2015/084
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
59 words
In an improved process of passing an aerosol mixture through a filter, and thereby measuring the efficiency of the filter, the improvement consisting essentially of said aerosol being solely a poly-alpha olefin having chain lengths in % by volume of about: ______________________________________
% Carbon atoms, chain length
______________________________________
0.6 20
82.1 30
16.0 40
1.0 50
2.0 60.
______________________________________
Claim 2
Dependent Claim
59 words
In an improved process of passing an aerosol mixture through a filter, and thereby measuring the efficiency of the filter, the improvement consisting essentially of said aerosol being solely a poly-alpha olefin having chain lengths in % by volume of about: ______________________________________
% Carbon atoms, chain length
______________________________________
0.6 20
82.1 30
16.0 40
1.0 50
2.0 60.
______________________________________
Claim 3
Dependent Claim
25 words
The process of claim 1 wherein the concentration of said aerosol at said filter is 100 mg/m 3 plus or minus 20 mg/m 3 .
Claim 4
Dependent Claim
13 words
The process of claim 1 wherein said measuring is done by light-scattering means.
Claim 5
Dependent Claim
15 words
The process of claim 1 wherein the aerosol geometric mean diameter is about 0.20 micrometers.
Claim 6
Dependent Claim
14 words
The process of claim 1 wherein the aerosol geometric standard deviation is about 1.25.
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) | 1994-10-21 | 1995-04-22 | 1995-10-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-10-21 | 1999-04-22 | 1999-10-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-10-21 | 2003-04-22 | 2003-10-22 | $7700.00 | Window Closed / Lapsed |