Patents by Inventor Hassan A. Hakemi

Hassan A. Hakemi 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).

  • Thermotropic copolyester and process for preparing it and use thereof
    Patent number: 4963642
    Abstract: A thermotropic copolyester, having a liquid-crystallne mesophase of nematic structure within a desired range of temperatures, contains units derived from:(a) a saturated aliphatic bicarboxy acid;(b) 4,4'-dihydroxy-biphenyl;(c) p-hydroxybenzoic acid; and(d) 2,6-hydroxynaphthoic acid.Such a thermotropic copolyester displays improved characteristics, in particular as regards its extensional modulus and its tensile strength, when is used as a self-reinforced material, or as a reinforcer material for traditional thermoplastic polymers.
    Type: Grant
    Filed: May 30, 1989
    Date of Patent: October 16, 1990
    Assignee: Eniricerche S.p.A.
    Inventors: Arnaldo Roggero, Ugo Pedretti, Pier L. Magagnini, Enrico Montani, Hassan A. Hakemi, Bruno Bresci, Francesco P. La Mantia
  • Compatible blends of main chain and side chain thermotropic liquid crystal polymers
    Patent number: 4952334
    Abstract: This invention relates to compatible blends of liquid crystal main chain polymer and liquid crystal side polymers having the same or similar mesogenic groups.
    Type: Grant
    Filed: December 5, 1989
    Date of Patent: August 28, 1990
    Assignee: S. C. Johnson & Son, Inc.
    Inventors: Hassan A. Hakemi, Husam A. A. Rasoul, Robert W. Stackman
  • Thermotropic copolyazomethines and process for preparing them
    Patent number: 4888409
    Abstract: Thermotropic copolyazomethines having a mesophase temperature range lying within a desired range of values are obtained by copolymerizing terephthalic aldehyde with at least two different 1,n-bis(4-aminophenoxy)alkanes.Such copolyazomethines are particularly useful as reinforcing materials for the usual thermoplastic polymers, such as polycarbonate, polybutyleneterephthalate, polyethyleneterephthalate and polyamides.
    Type: Grant
    Filed: December 6, 1988
    Date of Patent: December 19, 1989
    Assignee: Eniricerche S.p.A.
    Inventors: Ugo Pedretti, Cesarina Bonfanti, Enrico Montani, Hassan A. Hakemi, Arnaldo Roggero
  • Compatible blends of main chain and side chain thermotropic liquid crystal polymers
    Patent number: 4842754
    Abstract: This invention relates to compatible blends of liquid crystal main chain polymers and liquid crystal side chain polymers having the same or similar mesogenic groups.
    Type: Grant
    Filed: October 22, 1987
    Date of Patent: June 27, 1989
    Assignee: S. C. Johnson & Son, Inc.
    Inventors: Hassan A. Hakemi, Husam A. A. Rasoul, Robert W. Stackman