Patents by Inventor Daniel Raymond Rault

Daniel Raymond Rault 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).

  • Process for producing a metal sheet to be deep drawn or extra-deep drawn for the fabrication of shaped metal parts
    Patent number: 4111032
    Abstract: A metal sheet which is intended to be subjected to a drawing operation for the fabrication of a shaped metal part has on its surface a roughness in the form of plateau portions in relief defining between them recessed valley portions, the average ratio of the dimension of the valley portions to the dimension of the plateau portions in any direction on the surface of the sheet being from 1:1 to 3:1, preferably 3:2 to 5:2, the average dimension of the plateau portions being from 40 to 200 micrometers, preferably 60 to 120 micrometers and the height of the plateau portions being more than 6 micrometers, preferably 10 to 25 micrometers. This surface roughness reduces the risk of seizing during drawing even if the sheet is coated with a soft metal such as tin.
    Type: Grant
    Filed: July 11, 1977
    Date of Patent: September 5, 1978
    Assignee: Societe Lorraine de Laminage Continu
    Inventor: Daniel Raymond Rault
  • Metal sheet for drawing
    Patent number: 4071657
    Abstract: A metal sheet which is intended to be subjected to a drawing operation for the fabrication of a shaped metal part has on its surface a roughness in the form of plateau portions in relief defining between them recessed valley portions, the average ratio of the dimension of the valley portions to the dimension of the plateau portions in any direction on the surface of the sheet being from 1:1 to 3:1, preferably 3:2 to 5:2, the average dimension of the plateau portions being from 40 to 200 micrometers, preferably 60 to 120 micrometers and the height of the plateau portions being more than 6 micrometers, preferably 10 to 25 micrometers. This surface roughness reduces the risk of seizing during drawing even if the sheet is coated with a soft metal such as tin.
    Type: Grant
    Filed: November 4, 1975
    Date of Patent: January 31, 1978
    Assignee: Societe Lorraine de Laminage Continu
    Inventor: Daniel Raymond Rault