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:
Nov. 12, 1991
Filed:
Jun. 30, 1989
Applicant:
Inventors:
Helge Frank, Lubeck, DE;
Eric Hecker, Stockelsdorf, DE;
Reinhard Eifrig, Lubeck, DE;
Dieter Weismann, Gross Gronau, DE;
Peter Gebhardt, Stockelsdorf, DE;
Assignee:
Dragerwerk Aktiengesellschaft, Lubeck, US;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
A62B / ; A61M / ;
U.S. Cl.
CPC ...
12820524 ; 12820426 ; 12820418 ;
Abstract
The invention is directed to a controllable expiration valve having a control valve for generating an end expiratory overpressure with the control valve providing the changeable control pressure. The expiration valve is improved so that it is made controllable for compensating dynamic end expiratory overpressure. For this purpose, the membrane chamber of the expiration valve as well as the outflow chamber of the control valve are connected with a device for generating an underpressure.