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:
Aug. 10, 1993
Filed:
Nov. 13, 1991
Applicant:
Inventors:
Assignee:
Valois (Societe Anonyme), Le Neubourg, FR;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
B05B / ;
U.S. Cl.
CPC ...
222321 ; 222375 ;
Abstract
A pump for dispensing or spraying a fluid product comprises a pump body delimiting a pump chamber in which slides a piston. The pump comprises a hollow plunger-rod having an outlet passage. The plunger-rod is coupled to the piston to actuate the piston and to enable escape of the product. The pump further comprises an aspiration chamber which communicates with the hollow plunger-rod and which is reduced in volume when the plunger-rod is depressed and increased in volume when pressure is removed from the plunger-rod. The aspiration chamber is delimited by the piston and the plunger-rod and the volume of the chamber is varied by relative sliding movement between the plunger-rod and the piston.