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:
Apr. 30, 2002
Filed:
Dec. 10, 1999
Wilhelmus Johannes Maas, Someren, NL;
Petrus Lambertus Hurkmans, Someren, NL;
AFA Polytek, B.V., , NL;
Abstract
A precompression system for a liquid dispenser prevents liquid from being discharged from the dispenser until a predetermined pressure level has been attained within the dispenser. The liquid dispenser preferably has a liquid inlet and a liquid outlet for discharging the liquid. The precompression system includes a pump chamber having a piston movable in the pump chamber for drawing liquid through the inlet and discharging the liquid through the outlet. The precompression system also includes a valve chamber having a spring valve disposed between the pump chamber and the outlet and being operable to allow liquid in the pump chamber to reach the outlet only after a predetermined pressure is established in the pump chamber and to stop liquid from reaching the outlet when the pressure in the pump chamber falls below the predetermined pressure. The spring valve includes a resilient diaphragm that is normally closed over a valve seat opening in the valve chamber, as well as a peripheral flap extending from the first end of the spring valve for selectively closing the inlet. The valve chamber is in fluid communication with but not in alignment with the pump chamber.