Patents by Inventor Stephen Paul Gibson

Stephen Paul Gibson 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).

  • Antiparastic auermectin derivatives
    Patent number: 5883080
    Abstract: Antiparasitic avermectin derivatives of formula (I), where the broken line represents an optional bond, R.sup.1 and R.sup.4 are independently H, OH, halo, oximino, or an organic radical, R.sup.2, R.sup.6 and R.sup.7 are organic radicals and R.sup.3 is alpha-oleandrosyl or 4'-(alpha-oleandrosyl)-alpha-oleandrosyl optionally substituted at the 4'- or 4"-position, and R.sup.12 and R.sup.13 are independently H, CN, CONH.sub.2, C.sub.1 -C.sub.8 alkyl or aryl optionally substituted with at least one halo, OH, C.sub.1 -C.sub.8 alkylthio group.
    Type: Grant
    Filed: January 16, 1998
    Date of Patent: March 16, 1999
    Assignee: Pfizer Inc.
    Inventors: Christopher James Dutton, Stephen Paul Gibson, Michael John Witty
  • Process and antiparasitic intermediates for doramectin
    Patent number: 5665708
    Abstract: Intermediates and a process for preparing doramectin, the compound of formula (I), semisynthetically from by-product in the fermentation procedure which also yields the compound of formula (I). The intermediates prepared by the process of this invention also have utility as antiparasitic agents. The process of this invention utilizes continuous reaction inert gas sparging during the pyrolysis step, resulting in a significant improvement in the overall yield of this conversion.
    Type: Grant
    Filed: March 8, 1996
    Date of Patent: September 9, 1997
    Assignee: Pfizer Inc.
    Inventors: Constantine Sklavounos, Thomas Charles Crawford, Neil Demers, Stephen Paul Gibson, Charles William Murtiashaw, deceased