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

Spreader/grader with adjustable transverse blades

Patent 5397200 Issued on March 14, 1995. Estimated Expiration Date: Icon_subject September 27, 2013. 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

1232314

1393385

Particulate material spreader with selectively detachable three-point linkage
Patent #: 4196778
Issued on: 04/08/1980
Inventor: Smith

Spreader/grader
Patent #: 4320988
Issued on: 03/23/1982
Inventor: Seal

Three-point hitch attached grader with adjustable blades
Patent #: 5191943
Issued on: 03/09/1993
Inventor: Minor, et al.

Combination spreader/grader apparatus Patent #: 5332331
Issued on: 07/26/1994
Inventor: Critz, et al.

Inventor

Application

No. 126567 filed on 09/27/1993

US Classes:

404/118, Screed or drag172/393, Spaced parallel runners with tool mounted therebetween172/445.1, Including blade, scraper, or smoother172/448, With auxiliary vertical adjustmentD15/28Element or attachment (4)

Examiners

Primary: Britts, Ramon S.
Assistant: Lisehora, James A.

Attorney, Agent or Firm

International Classes

E01C 019/22
E02F 003/76

Abstract

A spreader/grader attachable to a three point hitch of a tractor and including a pair of longitudinally extending, parallel, transversely spaced side pans or frame members oriented in fixed relation to each other and operatively connected to a three point hitch. Extending between the side pans or frame members is a plurality of transverse blades for engaging a soil surface in order to perform various earth working functions. The blades include a support structure and attachment arrangement at each end thereof for connection with the side pans or frame members to enable the blades to be oriented in a fixed or varied relation to the frame members or adjustable in relation to the frame members to orient either end of a blade forwardly or rearwardly in relation to the other end and either end of the blade upwardly or downwardly in relation to the other end and to vary the angle of a blade about a longitudinal axis with respect to a horizontal plane to vary the angle of attack of the blade in relation to the soil surface in order to provide effective grading, spreading and other earth working functions.

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