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:
Mar. 10, 1987
Filed:
Jun. 12, 1985
Layton A Wise, Washington, PA (US);
Mine Safety Appliances Company, Pittsburgh, PA (US);
Abstract
A viewing assembly for use in the lens opening of a protective facemask comprising: a transparent housing adaptor sealingly mated to the lens: a substantially rectangular retainer for a lens cartridge assembly comprising opposing planar panels and providing in the latched position a recess that sealingly retains an enclosed lens cartridge assembly; an open area in each of said planar surfaces providing a common portal for viewing through the holder body; a lens cartridge holder defining a first open frame portion the outer periphery of the assembly being adapted to sealingly engage the inner surface of the holder adaptor; a first transparent lens positioned within said housing and abutting the assembly flange and positioned so as to provide sealing contact therewith; at least one other similarly configured lens adapted to adjoin the first lens yet being removable therefrom by manual manipulation; and at least one flexible strip secured to each of the removable lenses and at its other extremity being of a sufficient length to permit manual grasping, thereby serving to permit removal of a lens from its peripheral retention by said lens holder.