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:
Jun. 12, 1990
Filed:
Oct. 06, 1988
Applicant:
Inventors:
Giulio Cappa, Milan, IT;
Romano Moscatelli, Rome, IT;
Assignees:
Industrie Pirelli, Milan, IT;
Ministero Della Difesa, Rome, IT;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
A62B / ;
U.S. Cl.
CPC ...
12820227 ; 12820524 ; 12820617 ;
Abstract
A device is provided for preventing the inflow of air into a gas mask during the substitution of its filter in the presence of a contaminated atmosphere. The device includes a small plate having a central stem which passes through the support for a check valve admitting air to the respiratory tract of the user and a spring which pushes the small plate against the diaphragm of the check valve when the filter is removed from the mask to prevent inflow of air into the mask.