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. 28, 2012
Filed:
Apr. 01, 2008
Applicant:
Feiyu LI, Xiamen, CN;
Inventor:
Feiyu Li, Xiamen, CN;
Assignee:
WDI International, Inc., Irvine, CA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
E03D 1/35 (2006.01);
U.S. Cl.
CPC ...
Abstract
A toilet flush flapper valve includes a flapper and a ballast with a vent hole for enabling air to escape from the ballast, the ballast is rotatably fixed to the flapper for enabling positioning of the vent hole for controlling buoyancy of the ballast in order to control closing time of said flapper.