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:
Dec. 24, 2002
Filed:
Sep. 12, 2000
Len Curado, East Greenwich, RI (US);
Edna M. deMedeiros, West Warwick, RI (US);
North Safety Products, Inc., Cranston, RI (US);
Abstract
A rotationally adjustable respirator cartridge having a self-contained end of service life indicator adjacent the interior of a sidewall of the cartridge shell and in contact with the filter medium provides a color-changing display field that is visible to the wearer of the respirator through a transparent portion of the sidewall. A display window is defined by an opaque border area that surrounds the sensor display field and obscures a predetermined portion of the downstream end of the indicator to provide a desired margin of safety to the wearer. In order to permit the wearer to rotationally position the color-changing display field in the line of sight through the transparent portion of the respirator facepiece, the cartridge is provided with a rotatable mounting assembly that is continuously rotatable in one direction and that forms a seal with the cartridge shell.