U.S. patents available from 1976 to present.
U.S. patent applications available from 2005 to present.

Subsoil plow point

Patent 4538689 Issued on September 3, 1985. Estimated Expiration Date: Icon_subject March 13, 2004. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.

Patent References

670017

774324

1169879

1255442

1603486

1982746

2034229

2034461

3171500

Tillage implement Patent #: 4331204
Issued on: 05/25/1982
Inventor: White

Inventor

Application

No. 06/566197 filed on 03/13/1984

US Classes:

172/700, With separate vertically spaced earth working portion attached to same standard172/713, Tooth172/724Wings integral

Examiners

Primary: Johnson, Richard J.

Attorney, Agent or Firm

International Classes

A01B 21/00 (20060101)
A01B 21/08 (20060101)
A01B 49/02 (20060101)
A01B 49/00 (20060101)

Abstract

An improved plow point such as used on a chisel plow has a forward tooth for breaking the soil. Wings extend outwardly and rearwardly of the tooth portion of the tool at a shallow angle. That is, the leading edges of the wings slope downwardly and slightly rearwardly from the tooth. After the tooth breaks the soil, the wings raise, twist and turn the broken deep soil. This lifting action provides aeration of the soil. The wings also bring up some deep soil and leave large chunks of soil that become mellow due to the freezing and thawing cycles during the winter. The outboard rear edge of each wing may be turned slightly downward which enhances the twisting motion of the soil. All of this is done without creating a plow sole.

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