Patents by Inventor Jan Willemsen

Jan Willemsen 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).

  • Rotatable drum drive
    Patent number: 4317291
    Abstract: A device for treating solid and/or liquid materials comprises a drum driven for rotation about a horizontal axis by means of an endless chain.An expensive toothed rim surrounding the drum is avoided, as it is possible that the chain engages a toothless portion of the drum periphery.
    Type: Grant
    Filed: November 5, 1979
    Date of Patent: March 2, 1982
    Assignee: Expert N.V.
    Inventors: Marinus H. Weststrate, Jan Willemsen
  • Device for cooling castings and for treating moulding sand
    Patent number: 4154290
    Abstract: A device for cooling castings and for treating moulding sand comprises a driven, rotatably journalled drum provided with internal catches extending substantially axially between an inlet end and an outlet end of the drum.For improving the stirring effect of the catches and for avoiding damage of castings and loss of valuable dust from the moulding sand, the catches have a stronger scooping effect near the inlet end than near the outlet end.
    Type: Grant
    Filed: November 9, 1977
    Date of Patent: May 15, 1979
    Assignee: Expert N.V.
    Inventors: Marinus H. Weststrate, Jan Willemsen
  • plant named ‘Sea Heart’
    Patent number: PP24684
    Abstract: A new cultivar of Brunnera macrophylla, ‘Sea Heart’, characterized by its leaves that are large, strong, round-cordate in shape, conspicuously mottled with silver between green veins, its resistance to sun scorch, and its vigorous growth habit.
    Type: Grant
    Filed: November 13, 2012
    Date of Patent: July 22, 2014
    Inventor: Peter Jan Willemsen
  • plant named ‘Silver Heart’
    Patent number: PP24685
    Abstract: A new cultivar of Brunnera macrophylla, ‘Silver Heart’, characterized by its leaves that are large, strong, round-cordate in shape, and heavily mottled with silver with very thin green veins and margins, and its resistance to sun scorch.
    Type: Grant
    Filed: November 13, 2012
    Date of Patent: July 22, 2014
    Inventor: Peter Jan Willemsen