09232687 is referenced by 15 patents and cites 359 patents.

An agricultural implement includes at least one row unit having a plurality of support members, each of which is pivotably coupled to an attachment frame or another of the support members to permit vertical pivoting vertical movement of the support members, and a plurality of soil-engaging tools, each of which is coupled to at least one of the support members. A plurality of hydraulic cylinders are coupled to the support members for urging the support members downwardly toward the soil. A plurality of controllable pressure control valves are coupled to the hydraulic cylinders for controlling the pressure of hydraulic fluid supplied to the cylinders. A plurality of sensors produce electrical signals corresponding to predetermined conditions, and a controller is coupled to the sensor and the controllable pressure control valves. The controller receives the electrical signals from the sensors and produces control signals for controlling the pressure control valves.

Title
Agricultural systems
Application Number
14/146822
Publication Number
9232687 (B2)
Application Date
January 3, 2014
Publication Date
January 12, 2016
Inventor
Joseph D Bassett
Sycamore
IL, US
Agent
Nixon Peabody
Assignee
Dawn Equipment Company
IL, US
IPC
A01C 7/00
A01B 63/00
A01C 7/20
A01C 5/06
A01B 63/08
A01B 61/04
A01B 49/06
View Original Source