Patents by Inventor Roelf Pepping

Roelf Pepping 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 for dewatering sludge
    Patent number: 4101400
    Abstract: Sludge is dewatered to a dry content of more than 25% by a combination of(a) pre-conditioning the sludge by flocculation with polymeric flocculants;(b) pre-dewatering the conditioned sludge to a certain solid content corresponding with shovel consistency;(c) thereafter dewatering the sludge further through electroendosmosis under pressure.This combination renders it possible to produce a product having a dry content of more than about 30% irrespective of the origin of the sludge.
    Type: Grant
    Filed: May 20, 1977
    Date of Patent: July 18, 1978
    Assignee: Machinefabriek W. Hubert & Co. B.V.
    Inventor: Roelf Pepping
  • Device for the purification of waste water
    Patent number: 4062911
    Abstract: The disclosure relates to a device for the purification of waste water with the aid of active silt, comprising an open basin or the like with supply and discharge means for the water, in which basin a partition is provided in such a manner that a closed circulating channel is obtained, a rotatable aerator with a vertical axis being mounted in such manner and adapted to be driven in such a sense that on rotation thereof the water is circulated in said closed channel, characterized in that one or more aerator are mounted near an outer wall or a partition of the basin.
    Type: Grant
    Filed: August 18, 1976
    Date of Patent: December 13, 1977
    Assignee: Landustrie Sneek Machinefabriek Elektrotechniek B.V.
    Inventor: Roelf Pepping