Patents by Inventor Melvin C. Kuehn

Melvin C. Kuehn has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Bi-fold hay rake system
    Patent number: 5065570
    Abstract: This invention relates to the improvement of a new hay rake system that utilizes two separate wheel-type rakes which are substantially merged into one by mounting them to fold in for traveling and fold out for the raking position.
    Type: Grant
    Filed: June 13, 1990
    Date of Patent: November 19, 1991
    Inventor: Melvin C. Kuehn
  • Bi-fold hay rake system
    Patent number: 4947631
    Abstract: This invention relates to the improvement of a new hay rake system that is comprised of two separate wheel-type rakes into one by mounting them on one frame in such a manner permitting them to fold in for traveling and fold out for the raking position.
    Type: Grant
    Filed: November 24, 1989
    Date of Patent: August 14, 1990
    Inventor: Melvin C. Kuehn
  • Bi-fold hay rake system
    Patent number: 4882900
    Abstract: This invention relates to the improvement of a new hay rake system that is comprised of two separate wheel-type rakes into one by mounting them on one frame in such a manner permitting them to fold in for traveling and fold out for the raking position.
    Type: Grant
    Filed: February 24, 1988
    Date of Patent: November 28, 1989
    Inventor: Melvin C. Kuehn
  • Synthetic slate
    Patent number: 4073848
    Abstract: A solid, slate-like product, a composition and method of producing the same comprising a substantially uniform mixture of at least five parts by weight of a finely divided taconite iron ore material containing at least about 1 percent magnetite therein and an amine-formaldehyde resin such as urea-formaldehyde or melamine-formaldehyde. The mixture, heated under pressure, forms a dense slate-like material.
    Type: Grant
    Filed: December 21, 1976
    Date of Patent: February 14, 1978
    Assignee: Ormite, Inc.
    Inventor: Melvin C. Kuehn
  • Synthetic slate
    Patent number: 4038242
    Abstract: A solid, slate-like product, a composition and method of producing the same comprising a substantially uniform mixture of at least five parts by weight of a finely divided taconite iron ore material containing at least about 1 percent magnetite therein and an amine-formaldehyde resin such as urea-formaldehyde or melamine-formaldehyde. The mixture, heated under pressure, forms a dense slate-like material.
    Type: Grant
    Filed: May 12, 1975
    Date of Patent: July 26, 1977
    Assignee: Ormite, Inc.
    Inventor: Melvin C. Kuehn