Patents by Inventor Jan H. de Lange

Jan H. de Lange 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).

  • Method of and apparatus for curing tobacco
    Patent number: 4559956
    Abstract: In the curing of tobacco leaf in a curer heated air is circulated through the curer and controlled so that a first temperature is maintained in the curer for a given period of time. During this period the relative humidity level is reduced to a desired level. Thereafter a maximum predetermined temperature difference is maintained between upper and lower zones in the curer to dry the leaf.
    Type: Grant
    Filed: February 28, 1983
    Date of Patent: December 24, 1985
    Assignee: Modsa (Proprietary) Limited
    Inventors: Jan H. De Lange, Ernest Fick
  • Curing of tobacco leaf
    Patent number: 4470422
    Abstract: A method of, and apparatus for, curing tobacco leaf in a curer barn. Air is caused to circulate through the barn to dry the leaf. The temperature of the air is controlled to maintain a predetermined temperature or humidity difference between upper and lower zones inside the barn, within a predetermined tolerance. The result is that the curing process is optimally controlled by the condition of the leaf itself and independently of ambient conditions.
    Type: Grant
    Filed: January 19, 1981
    Date of Patent: September 11, 1984
    Assignee: Modsa (Proprietary) Limited
    Inventors: Barend C. Joubert, Jan H. de Lange