Patents by Inventor Petrus J. G. Frijters

Petrus J. G. Frijters 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 and device for raising worms, method of raising worms in nutrition limited by inhibiting means, method of producing worm castings, and holder for raising worms
    Patent number: 4513685
    Abstract: A method and a device are disclosed for raising worms. The worms are fed in accordance with a continuously growing nutritional chain in a manner such that a migration of a worm population following said chain is produced. At least once an accretion of the worm population is separated leaving a migrating stock population in the nutritional chain, whereas the accretion migrates in the direction of an accretion nutritional chain which starts from the stock nutritional chain, and can be harvested therefrom. Apparatus is described for raising the worms under conditions which are optimal for the farmer and depend, for instance, on economical and seasonal conditions.The method and/or device can be advantageously used for producing worm casting, since the worms can be maintained under conditions whereby the conversion velocity of the nutrition offered to the worms is maximal over a long period of time.
    Type: Grant
    Filed: March 30, 1983
    Date of Patent: April 30, 1985
    Inventors: Petrus J. G. Frijters, Antonie F. van Es