Invention Grant
- Patent Title: Method of controlling a powered air purifying respirator
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Application No.: US16092488Application Date: 2017-04-11
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Publication No.: US11278749B2Publication Date: 2022-03-22
- Inventor: Keith K. Mclaughlin , Douglas D. Jensen , Sean R. Kilmer , Andrew Murphy
- Applicant: 3M INNOVATIVE PROPERTIES COMPANY
- Applicant Address: US MN St. Paul
- Assignee: 3M INNOVATIVE PROPERTIES COMPANY
- Current Assignee: 3M INNOVATIVE PROPERTIES COMPANY
- Current Assignee Address: US MN St. Paul
- Agent Steven A. Bern; Dena M. Ehrich
- International Application: PCT/US2017/026944 WO 20170411
- International Announcement: WO2017/180583 WO 20171019
- Main IPC: A62B7/10
- IPC: A62B7/10 ; A62B18/00 ; A62B18/04 ; H01M10/48 ; F16K31/02 ; H01M10/42

Abstract:
There is provided a method of controlling a powered air purifying respirator blower system to deliver a substantially uniform volumetric airflow to a user, the system comprising a fan powered by a battery in communication with a variable speed electric motor, the variable speed electric motor is controlled by an electronic control unit for delivering a forced flow of air through at least one filter to a user, comprising the steps of: (a) determining an estimated system run time by summing a battery run time remaining and a system run time; and (b) altering a speed of the variable speed electric motor when the estimated system run time is equal to or less than a desired system run time.
Public/Granted literature
- US20190126076A1 Method Of Controlling A Powered Air Purifying Respirator Public/Granted day:2019-05-02
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