Patents by Inventor Bert Steffens

Bert Steffens 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).

  • Patent number: 4664320
    Abstract: Sanitary articles formed of cellulose flock and non-flock carriers or covers are shredded by rotating entrainers, which are arranged in an enclosed housing. The cellulose flock thus separated is removed from the housing under suction through a sieve which only allow the cellulose flock through. The removal is effected before the covers have been shredded to such an extent that they pass through the sieve. The shredded cover material is then removed separately.
    Type: Grant
    Filed: November 13, 1984
    Date of Patent: May 12, 1987
    Inventor: Bert Steffens
  • Patent number: 4500040
    Abstract: Sanitary articles formed of cellulose flock and non-flock carriers or covers are shredded by rotating entrainers, which are arranged in an enclosed housing. The cellulose flock thus separated is removed from the housing under suction through a sieve which only allow the cellulose flock through. The removal is effected before the covers have been shredded to such an extent that they pass through the sieve. The shredded cover material is then removed separately.
    Type: Grant
    Filed: June 10, 1982
    Date of Patent: February 19, 1985
    Inventor: Bert Steffens
  • Patent number: 4303501
    Abstract: There is provided a process for the continuous separation of discarded hygiene articles into their components, namely flock and/or cut absorbent materials on the one hand and sheet coverings on the other comprising first tearing the discarded hygiene articles into large pieces and then conducting the pieces over an oscillating sieve surface, preferably over an oscillating sieve device having decreasing mesh widths with the smallest mesh width being so selected that the flocculent and/or cut absorbent material still can fall through while the large pieces of torn covering are always carried off as sieve residues.
    Type: Grant
    Filed: October 9, 1979
    Date of Patent: December 1, 1981
    Inventor: Bert Steffens
  • Patent number: 4144623
    Abstract: There is set forth a process for the production of a tampon, particularly for menstrual hygiene in which a fleece of absorbent cotton or similar material is wound up together with a retrieving string arranged on it. A fleece track is carried along approximately horizontally by a conveying device, a string coming from a supply roll is placed on the fleece track to be carried along in the direction of conveyance and subsequently cut off on the fleece track into a retrieving string, whereupon one part of the retrieving string is pressed onto the fleece track and the other part of the retrieving string is turned and whereupon the fleece is torn off the fleece track and wound up on a winding pin together with its retrieving string. There is also described an apparatus for carrying out the process.
    Type: Grant
    Filed: June 27, 1977
    Date of Patent: March 20, 1979
    Inventor: Bert Steffens