Patents by Inventor Giuseppe Ajroldi

Giuseppe Ajroldi 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).

  • Process of making multifilament yarns of thermoplastic polymers based on tetrafluoroethylene
    Patent number: 5618481
    Abstract: A multifilament yarn of a thermoplastic polymer based on tetrafluoroethylene, having high mechanical strength and dimensional stability at high temperatures (200.degree.-250.degree. C.), is prepared by melt extrusion through a die characterized by a hole density comprised between 10 and 150 holes/cm.sup.2 and provided with a cooling system of the emerging yarn of high efficiency and uniformity. The multifilament yarn can be subsequently drawn to obtain a fiber with even further improved tensile strength and modulus.
    Type: Grant
    Filed: June 4, 1996
    Date of Patent: April 8, 1997
    Assignee: Ausimont S.p.A.
    Inventors: Giandomenico Vita, Giuseppe Ajroldi, Mario Miani
  • Multifilament yarns of thermoplastic polymers based on tetrafluoroethylene, and fibers obtained therefrom
    Patent number: 5552219
    Abstract: A multifilament yarn of a thermoplastic polymer based on tetrafluoroethylene, having high mechanical strength and dimensional stability at high temperatures (200.degree.-250.degree. C.), is prepared by melt extrusion through a die characterized by a hole density comprised between 10 and 150 holes/cm.sup.2 and provided with a cooling system of the emerging yarn of high efficiency and uniformity. The multifilament yarn can be subsequently drawn to obtain a fiber with even further improved tensile strength and modulus.
    Type: Grant
    Filed: June 1, 1995
    Date of Patent: September 3, 1996
    Assignee: Ausimont S.p.A.
    Inventors: Giandomenico Vita, Giuseppe Ajroldi, Mario Miani
  • Multifilament yarns of thermoplastic polymers based on tetrafluoroethylene, and drawn multifilament yarns obtained therefrom
    Patent number: 5460882
    Abstract: A multifilament yarn of a thermoplastic polymer based on tetrafluoroethylene, having high mechanical strength and dimensional stability at high temperatures (200.degree.-250.degree. C.), is prepared by melt extrusion through a die characterized by a hole density comprised between 10 and 150 holes/cm.sup.2 and provided with a cooling system of the emerging yarn of high efficiency and uniformity. The multifilament yarn can be subsequently drawn to obtain a drawn multifilament yarn with even further improved tensile strength and modulus.
    Type: Grant
    Filed: October 27, 1993
    Date of Patent: October 24, 1995
    Assignee: Ausimont S.p.A.
    Inventors: Giandomenico Vita, Giuseppe Ajroldi, Mario Miani
  • Low haze transparent compositions and processes for preparing them
    Patent number: 5183851
    Abstract: This invention relates to low haze impact-resistant transparent compositions, comprising:(a) 40-99% by weight of a thermoplastic resin based on homopolymers and/or copolymers of alkyl-methacrylates with minor amounts of alkyl-acrylates, wherein the alkyl group contains from 1 to 8 carbon atoms, and(b) 60-1% by weight of a polymer having a multi-layer structure, based on elastomers arranged sequentially to thermoplastic resins as defined in step (a).
    Type: Grant
    Filed: September 3, 1991
    Date of Patent: February 2, 1993
    Assignee: ELF Atochem Italia S.r.l.
    Inventors: Francesco Visani, Carlo Tavazzani, Giuseppe Ajroldi, Giovanni Castiglioni