Patents by Inventor Frederick O. Lassen

Frederick O. Lassen 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: 4256111
    Abstract: Chemically modified cellulose fibers such as those which have been subjected to phosphorylation or carboxymethylation or to polymer grafting-hydrolysis are refined in the presence of water, centrifuged to remove unbound water and extruded into filaments. The individual fibers are identifiable within the filaments and are generally aligned parallel to the filament axis. Certain embodiments of the filaments are highly absorbent, have fast wicking rates, and may be self-bonded to form integral nonwoven webs for use in disposable diapers, sanitary products, wipers and the like.
    Type: Grant
    Filed: October 1, 1973
    Date of Patent: March 17, 1981
    Assignee: Kimberly-Clark Corporation
    Inventor: Frederick O. Lassen
  • Patent number: 4049764
    Abstract: In the formation of highly absorbent and rapidly wicking filaments and web structures by extrusion and solvent drying of extrudates composed of highly swollen hydrophilic chemically modified cellulose fibers, improved results are obtained in the form of a softer and better wicking product by treatment of the extrudate prior to extrusion. The extrudate is a mass containing the swollen chemically modified cellulose fibers and a water content of up to 98% at the time of extrusion. By adding to the extrudate, prior to extrusion, an amount of from about 2 to 50% of the solvent to be used in drying in the form of pure solvent or in the form of a mixture containing solvent but which may contain water or other non-solvent and the solvent to be used in drying, a much better performing extrudate is produced which results in better filament formation, improved bonding between filaments, lower water content in the extrudate, faster drying of the extruded product, and a softer, better wicking product.
    Type: Grant
    Filed: April 2, 1975
    Date of Patent: September 20, 1977
    Assignee: Kimberly-Clark Corporation
    Inventors: Wayne C. Sigl, Frederick O. Lassen
  • Patent number: 3997647
    Abstract: Chemically modified cellulose fibers such as those which have been subjected to phosphorylation or carboxymethylation or to polymer grafting-hydrolysis are refined in the presence of water, centrifuged to remove unbound water and extruded into filaments. The individual fibers are identifiable within the filaments and are generally aligned parallel to the filament axis. Certain embodiments of the filaments are highly absorbent, have fast wicking rates, and may be self-bonded to form integral nonwoven webs for use in disposable diapers, sanitary products, wipes and the like.
    Type: Grant
    Filed: February 24, 1975
    Date of Patent: December 14, 1976
    Assignee: Kimberly-Clark Corporation
    Inventor: Frederick O. Lassen
  • Patent number: 3982325
    Abstract: Solvent-drying, particularly of water-wetted materials, is accomplished through the use of specific azeotropic mixed-solvent systems. The azeotropic systems used in the method of the invention are those which form two or more separate layers, in which the water distribution equilibrium favors the concentration of water or other liquid being removed in one layer over the other. The water or other liquid, therefore, concentrates in one layer facilitating removal by separation of the layers. Drying of the material takes place in the other layer which maintains a constant liquid concentration sufficiently low so as to produce a substantially dried product. Temperature control of the solvent bath and separator contents results in a single-layer drying bath and facilitates separation in a preferred embodiment.
    Type: Grant
    Filed: April 30, 1975
    Date of Patent: September 28, 1976
    Assignee: Kimberly-Clark Corporation
    Inventors: Wayne C. Sigl, Frederick O. Lassen