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:
Sep. 29, 2015
Filed:
Sep. 05, 2013
David J. Gramling, LeCenter, MN (US);
Paul L Ardison, St. Peter, MN (US);
David J. Gramling, LeCenter, MN (US);
Paul L Ardison, St. Peter, MN (US);
Other;
Abstract
A fertilizer system includes a supply vessel pressurized by anhydrous ammonia vapor. The fertilizer passes through a heat exchanger. Cooled fertilizer passes through a flow meter, an on/off valve and to a variable orifice distribution assembly body. A cage with axially elongated cage slots is press fit in a body bore with each slot aligned with an outlet port. Each port is connected to a soil knife by a conduit line. A piston with axially elongated piston slots is axially slidable in the cage. Each piston slot is moved axially in the cage to cooperate with a cage slot. An actuator moves the piston to a position that blocks flow through the piston slots and positions in which fertilizer flows through each piston slot and portions of each cage slot in communication with a piston slot. Vapor pressure in the supply vessel moves fertilizer to the knife opener.