Patents by Inventor Frantisek Ferkl

Frantisek Ferkl 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).

  • Open-end spinning machine
    Patent number: 4429522
    Abstract: An open-end spinning machine having an open-end spinning unit with novel apparatus for withdrawing impurities released in the spinning unit. An impurity releasing duct outlet of the sliver separation housing of the open-end spinning unit extends from said housing and has substantially the same cross-sectional inner height dimensions as those of the cleaning aperture, while a connecting tube inlet joined to said outlet is substantially conically flared, a gap being provided between said outlet and said inlet for the sucking-in of additional air.
    Type: Grant
    Filed: March 17, 1982
    Date of Patent: February 7, 1984
    Assignee: Vyzkumny ustav bavlnarsky
    Inventors: Frantisek Ferkl, Antonin Cap, Milos Vecera, Josef Skala, Vaclav Kopriva, Michal Blasko, Karel Pavek, Milan Chrtek, Jan Blasko