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, 1984
Filed:
Jul. 06, 1981
John R Baker, Houston, TX (US);
Baker International Corporation, Orange, CA (US);
Abstract
An improved flapper valve for installation for example, in a tubing string of a subterranean well is pivotally movable about a horizontal axis into a blocking position relative to the vertical fluid flow path of the tubing string. The flapper valve is circular and is formed from a tubular segment in such a manner that, when in the open position, its concave surface is substantially tangentially coincident with a projection of the cylindrical surface formed by the inside of the valve seat, and its convex surface prescribes a much larger chordal distance in a containing circle concentric with the valve seat than would a flat surface of the same diameter. Thus, a valve is provided wherein for a given housing diameter, the passageway through the valve can be proportionately larger.