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:
Sep. 30, 2003
Filed:
Jul. 18, 2002
Markus Ehrensperger, Hettlingen, CH;
Hans-Jörg Studer, Hittnau, CH;
HTS International Trading AG, Baar, CH;
Abstract
The invention relates to a dispenser for foamable liquids which has been improved with regard to the aspects of hygiene and reliability. According to the method, in addition to the pneumatic and hydraulic parts of the dispenser having a configuration which is to a great extent isolated from the external atmosphere, said dispenser has an air chamber ( ) which subjects a nozzle/expansion body ( ) first to an excess pressure and then to a negative pressure during the return stroke (H ) of an air piston ( ) via a lateral bore ( ). As a result, the outlet ( ) is first cleared and any remaining foam in the nozzle/expansion body ( ) is subsequently removed by suction and coagulated into soap solution. During the next working stroke, this minimal quantity of soap-solution is foamed again and expelled.