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. 27, 1991
Filed:
May. 24, 1989
Piero Battegazzore, Alessandria, IT;
Guala S.p.A., Alessandria, IT;
Abstract
A dispenser of paste products, in particular toothpaste, is composed of a cylindrical container provided with a headpiece carrying a paste product output and with a bottom wall fitting in an airtight manner therein for sliding movement one way toward the headpiece. The bottom wall consists of a plunger body having an axial cavity which is open downwardly and communicates, through radial passages, with the interior of the container, and of a dish-shaped body provided with a lug which fits snugly into the axial cavity. The outer surface of the lug on the dish-shaped body is provided with ribs which form, in co-operation with the inner wall of the axial cavity in the plunger body, channels extending along paths including at least one sharp change in direction. At the end of the container filling operation, the bottom wall is inserted and pushed against the toothpaste while trapped air is vented out through the channels. Once the air has been vented out, the flow of toothpaste which follows will stagnate inside the channels and seal them off, without flowing out of the container. Thus, the advantage is secured of having a bottom wall which automatically provides an airtight closure once the trapped air has been vented out.