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:
Feb. 24, 1998
Filed:
Mar. 11, 1996
Tanny Li, Walnut, CA (US);
Calmar Inc., City of Industry, CA (US);
Abstract
A pre-compression pump sprayer has a spring biased discharge poppet valve element with a seal in engagement with the wall of the piston stem, a seal interruption to establish a discharge valve open position, and an upstream directed throttle valve presenting a two-stage pressure build-up discharge valve establishing a predetermined pressure threshold which when exceeded by fluid pressure generated in the pump chamber during pumping immediately opens the throttle valve and abruptly releases the fluid pressure at the valve open position. The valve has an elongated probe extending into the pump chamber of an extent as to shift the poppet valve open upon engaging the inlet check valve upon a full downstroke of the piston for evacuating air from the pump chamber out through the discharge orifice to effect pump priming. During pumping operation, product is sucked back from around the discharge orifice into the discharge passage at the commencement of the piston suction stroke as the discharge valve remains momentarily open. An inlet check valve has a center of gravity located upstream of its valve seat to assure accurate seating of the inlet valve during pump operation at angles tilted from upright. And, a dry piston return spring is optionally provided, as is a diametral container vent seal.