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:
Aug. 17, 1999
Filed:
May. 09, 1997
Richard Caterini, Le May, FR;
Gustave Savourey, Biviers, FR;
Delegation Generale pour l'Armement, Paris, FR;
Abstract
A backpressure-modulating cartridge for a breathing mask includes a body defining a first chamber which communicates with the environment, a second chamber which communicates with the mask, and a passage which communicates with the first and second chambers. A guide rod is supported by the body and is disposed in the passage. A movable exhalation valve is supported by the guide rod in the first chamber and has at least one transfer hole opposite the passage. A mechanism is provided for urging the movable exhalation valve into a passage-closing position. A movable inhalation valve is provided which has a surface area that is smaller than a cross-section of the passage. A mechanism is provided for opposing the mechanism for urging such that the movable inhalation valve is urged to close the at least one transfer hole of the movable exhalation valve.