Measuring and testing – Sampler – sample handling – etc. – With constituent separation
Reexamination Certificate
2007-08-28
2007-08-28
Noland, Thomas P. (Department: 2856)
Measuring and testing
Sampler, sample handling, etc.
With constituent separation
C073S028040, C055S452000, C095S032000
Reexamination Certificate
active
10995745
ABSTRACT:
A circumferential slot virtual impactor includes a disk-shaped housing with an endless circumferential slot for receiving aerosols. The slot forms an acceleration nozzle, and a receiver nozzle spaced apart radially inwardly from the acceleration nozzle exit. In an annular gap between the two nozzles, negative pressure is selectively applied to draw a major flow of the aerosol axially away from the nozzles, while a minor flow of the aerosol is drawn radially inward and enters the receiver nozzle. A portion of the larger particles leaves the major flow and merges with the minor flow due to particle momentum, thus increasing the large-particle concentration of the minor flow. The acceleration nozzle incorporates convex curvature along its opposed interior surfaces, for a smoother aerosol flow and reduced large-particle deposition.
REFERENCES:
patent: 4301002 (1981-11-01), Loo
patent: 4972957 (1990-11-01), Liu et al.
patent: 5425802 (1995-06-01), Burton et al.
patent: 5571945 (1996-11-01), Koutrakis et al.
patent: 5788741 (1998-08-01), Burton et al.
patent: 5858043 (1999-01-01), Geise
patent: 5932795 (1999-08-01), Koutrakis et al.
patent: 5999250 (1999-12-01), Hairston et al.
patent: 6010554 (2000-01-01), Birmingham et al.
patent: 6386015 (2002-05-01), Rader et al.
patent: 6402817 (2002-06-01), Bergman
patent: 6664550 (2003-12-01), Rader et al.
patent: 7034549 (2006-04-01), Richardson et al.
patent: 7178380 (2007-02-01), Shekarriz et al.
patent: 2001/0032519 (2001-10-01), Liu et al.
patent: 2002/0124664 (2002-09-01), Call et al.
patent: 2002/0157993 (2002-10-01), Call et al.
patent: 2006/0096393 (2006-05-01), Pesiri
patent: 604843 (1978-09-01), None
patent: 195 04 275 (1996-08-01), None
patent: 02017921 (1990-01-01), None
Haglund et al., A Circumferential Slot Virtual Impactor,American Association for Aerosol Research, Apr. 27, 2004, pp. 664-674.
Haglund John S.
McFarland Andrew R.
Noland Thomas P.
Patterson Thuente Skaar & Christensen P.A.
The Texas A&M University System
LandOfFree
Circumferential slot virtual impactor for concentrating... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Circumferential slot virtual impactor for concentrating..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Circumferential slot virtual impactor for concentrating... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3876011