Patents by Inventor Carl Franz Seyfried

Carl Franz Seyfried 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).

  • Filter cloth, filtering process, and filtering device for liquid filtration
    Patent number: 6103132
    Abstract: A filter cloth for liquid filtration is made as a long-pile fabric, the pile threads 21 of which lie on the flow side and are flattened against the supporting fabric during the filtration and form a deep filter. At the time of back washing they are straightened by the back washing and release the dirt particles. The back washing is performed preferably by means of a suction bar 13, which at the same time acts mechanically on the pile threads, in order to promote an abrupt straightening of the pile threads at the time of back washing and the flattening of the pile threads after the back washing.
    Type: Grant
    Filed: December 16, 1998
    Date of Patent: August 15, 2000
    Inventors: Carl Franz Seyfried, Ulrich Grabbe