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. 28, 1990
Filed:
May. 17, 1989
S.A.R. S.p.A., Chieti, IT;
Abstract
A seal device for hand pumps for dispensing a substance such as paste or liquid products from bottles containing such products, wherein upper closure element of the pump is formed of elastically deformable plastic material. In an axial hole of the closure element there is provided an annular lip defining a circular aperture of diameter slightly less than that of a corresponding part of the pump stem to ensure a seal between the stem and closure element during pump operation even when the bottle is inclined or inverted, while allowing a certain quantity of air to be drawn in to compensate the quantity of substance dispensed. The stem collar has on its upper face a coaxial annular seal rib which engages against the lower face of the closure element under the thrust action of a spring to provide a seal when the pump is not under operation.