Personal air sampling system
Patent 4375667 Issued on March 1, 1983. Estimated Expiration Date: 
December 29, 2000. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
December 29, 2000. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 3279251 Apparatus for automatically measuring particulate emissions in gas flow Air sampling monitor Chemical tracer method of and structure for determination of instantaneous and total mass and volume fluid flow Flow measuring system Method and apparatus for sampling of a particle-bearing gas Patent #: 4246788 InventorApplicationNo. 06/220320 filed on 12/29/1980US Classes:73/861, VOLUME OR RATE OF FLOW702/45, Flow metering73/863.23Sieve, filter, or semipermeable membraneExaminersPrimary: Krass, Errol A.Attorney, Agent or FirmInternational ClassesG01F 1/68 (20060101)G01N 1/22 (20060101) AbstractA thermal anemometer is employed to detect the velocity of the air flowing through a personal air sampling device. A microprocessor system is employed to periodically read the signal from the thermal anemometer and calculate the sample air flow rate. The measured flow rate is integrated over the sample period to provide an indication of the total volume of air sampled. Flow rates need not be calibrated during the sample period to insure accurate collection data, thus providing an automated and accurate means for measuring air quality.Other References
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