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. 23, 2010
Filed:
Mar. 09, 2006
Hans Matthiessen, Bad Schwartau, DE;
Kai Kück, Hamburg, DE;
Hans Matthiessen, Bad Schwartau, DE;
Kai Kück, Hamburg, DE;
Dräger Safety AG & Co. KGaA, Lübeck, DE;
Abstract
A compressed air respirator with prolonged operating time due to rebreathing. The compressed air reservoir includes a compressed air reserve with a connected demand air supply valve, a reversible breathing gas reservoir () with a registering device () detecting the filling level of the breathing gas reservoir (), and with an inspiration and expiration line () for the user of the apparatus. A valve () is connected with the inspiration and expiration line () and, on the inlet side, with the compressed air reserve () with a demand air supply valve () and with the breathing gas reservoir () and, on the outlet side, with the ambient air () and with the breathing gas reservoir (). The valve means () is cyclically reversed by the registering device () in two phases such that depending on the filling level of the breathing gas reservoir (), the inspiration line () is first connected with the compressed air reserve () and the expiration line () with the breathing gas reservoir () during a first phase until the filling level of the breathing gas reservoir () reaches an upper reversing point for the valve means (), so that the inspiration line () is connected with the breathing gas reservoir () and the expiration line () with the ambient air () during a second phase until the filling level of the breathing gas reservoir () reaches a lower reversing point for the valve means () and the latter is again reversed as in the first phase.