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:
Jul. 07, 1981
Filed:
Dec. 18, 1979
Manfred Gdulla, Lubeck, DE;
Dragerwerk Aktiengesellschaft, Lubeck, DE;
Abstract
A method of supplying respiratory air to a user, and a breathing apparatus for this purpose. An inner and an outer mask are provided, the inner mask communicating only with the respiratory passages of the user and the outer mask covering the face of the user. Super-atmospheric pressure is maintained in the outer mask and the outer mask is communicated with the interior of the inner mask during suction created in the inner mask as a result of inhalation. Air flowing from the outer mask into the inner mask is replenished from an extraneous air supply. When the exhalation cycle begins, the communication between the inner and outer mask is interrupted and exhaled air is vented from the inner mask directly to the ambient atmosphere.