Patents by Inventor John F. Carefull

John F. Carefull 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: 5582786
    Abstract: A water-absorbent water-insoluble fibre or film is produced by extruding an aqueous solution of a water-soluble polymer into a gaseous medium to form fibre or film. The extruded fibre or film is collected at a moisture content of 8 to 25% based on the dry weight of the fibre or film and is further dried at a temperature no greater than 100.degree. C. before crosslinking the fibre or film at a temperature in the range 125.degree. to 250.degree. C. to a degree sufficient that the crosslinked fibre or film is water-insoluble. The fibre or film entering the crosslinking step has a moisture content which is reduced, preferably by at least 5%, and which is in the range 0 to 10%. Heat-crosslinked fibre is preferably treated with moist air after crosslinking to raise the moisture content of the fibre to at least 10%, particularly if the fibre is for textile processing. Water-absorbent water-insoluble coatings can be produced by a similar process.
    Type: Grant
    Filed: February 7, 1995
    Date of Patent: December 10, 1996
    Assignee: Courtaulds Fibres Limited
    Inventors: William Brunskill, John F. Carefull, Paul J. Akers