The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 01, 2015
Filed:
Aug. 11, 2010
Desmond T. Curran, Durham, GB;
Andrew Murphy, Ferryhill, GB;
Alan Lee, Loughborough, GB;
Vladimir Dubrovskii, St. Petersburg, RU;
Bengt Kallman, Leksand, SE;
Bengt Garbergs, Falun, SE;
Desmond T. Curran, Durham, GB;
Andrew Murphy, Ferryhill, GB;
Alan Lee, Loughborough, GB;
Vladimir Dubrovskii, St. Petersburg, RU;
Bengt Kallman, Leksand, SE;
Bengt Garbergs, Falun, SE;
3M Innovative Properties Company, St. Paul, MN (US);
Abstract
A method of controlling a powered air purifying respirator blower system to deliver a substantially uniform volumetric airflow to a user includes the steps of determining one of (a) ambient air density or (b) ambient air temperature and ambient air pressure, and adjusting an electrical characteristic of the electric motor in response to the determination and the at least two calibration values. The powered air purifying respirator blower system may include a fan powered by an electric motor, the motor being controlled by an electronic control unit for delivering a forced flow of filtered air to a user. In some embodiments, the electronic control unit may be operable to adjust an electrical characteristic of the motor in accordance with a predetermined correlation between the speed of the fan and the applied motor electrical characteristic for a selected substantially uniform volumetric airflow from the fan.