| 8351035 |
Particulate detection and calibration of sensors |
Kevin J. Goohs, Dieter Kita, John Hiss, III |
2013-01-08 |
| 7830510 |
Apparatus for high-accuracy fiber counting in air |
Benjamin Y. H. Liu, William D. Dick, Francisco J. Romay, Mark J. Battista |
2010-11-09 |
| 7197911 |
Methods and apparatus for mechanical resonance monitoring a mass concentration of particulate matter |
— |
2007-04-03 |
| 7111496 |
Methods and apparatus for monitoring a mass concentration of particulate matter |
Hansgerd Kramer |
2006-09-26 |
| 6055052 |
System for, and method of, monitoring airborne particulate, including particulate of the PM.sub.2.5 class |
— |
2000-04-25 |
| 5349844 |
System and method for resonant filter mass monitoring |
— |
1994-09-27 |
| 5319575 |
System and method for determining and outputting airborne particle concentration |
— |
1994-06-07 |
| 4940327 |
Method and apparatus for real time asbestos aerosol monitoring |
— |
1990-07-10 |
| 4402607 |
Automatic detector for microscopic dust on large-area, optically unpolished surfaces |
Lance McVay |
1983-09-06 |
| 4320975 |
Passive smoke plume opacity monitor |
— |
1982-03-23 |