Patents by Inventor Nicholas C. Fletcher

Nicholas C. Fletcher 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).

  • Ion-sensitive compounds
    Patent number: 5874584
    Abstract: An ion-sensitive calix(4)arene compound having the formula A.sup.2 +B.sup.2 - wherein A represents a cation capable of forming a receptor-substrate complex with an anion, and B represents sulfate, nitrate or borate, characterized in that the cation is an anion receptor represented by the formula ##STR1## wherein R.sup.1, R.sup.2, R.sup.3 and R.sup.4 are each independently a substituted or unsubstituted alkyl group or a substituted or unsubstituted aryl group wherein substituents are selected from alkyl C(O)NH--, aryl C(O)NH--, alkoxy, aryloxy, alkoxycarbonyl, aryloxycarbonyl, alkylsulfonamido, arylsulfonamido, alkylcarbonyl, alkoxycarbonyl, aryloxycarbonyl, cyano and nitro;R.sup.5 and R.sup.6 are each independently H or a lower alkyl group having from 1 to 4 carbon atoms, or R.sup.3 and R.sup.4 taken together represent an ethylene bridging group; and,n is 0 or 1.
    Type: Grant
    Filed: November 5, 1997
    Date of Patent: February 23, 1999
    Assignee: Eastman Kodak Company
    Inventors: Trevor John Wear, Christopher Peter Moore, Alistair J. Goulden, Paul D. Beer, Nicholas C. Fletcher
  • Ion-sensitive compounds
    Patent number: 5760231
    Abstract: An ion-sensitive calix(4)arene compound having the formula A.sup.2 +B.sup.2- wherein A represents a cation capable of forming a receptor-substrate complex with an anion, and B represents sulfate, nitrate or borate, characterized in that the cation is an anion receptor represented by the formula ##STR1## wherein R.sup.1, R.sup.2, R.sup.3 and R.sup.4 are each independently a substituted or unsubstituted alkyl group or a substituted or unsubstituted aryl group wherein substituents are selected from alkyl C(O)NH--, aryl C(O)NH--, alkoxy, aryloxy, alkoxycarbonyl, aryloxycarbonyl, alkylsulfonamido, arylsulfonamido, alkylcarbonyl, alkoxycarbonyl, aryloxycarbonyl, cyano and nitro;R.sup.5 and R.sup.6 are each independently H or a lower alkyl group having from 1 to 4 carbon atoms, or R.sup.3 and R.sup.4 taken together represent an ethylene bridging group; and,n is 0 or 1.
    Type: Grant
    Filed: October 22, 1996
    Date of Patent: June 2, 1998
    Assignee: Eastman Kodak Company
    Inventors: Trevor John Wear, Christopher Peter Moore, Alistair J. Goulden, Paul D. Beer, Nicholas C. Fletcher
  • Ion-sensitive compounds
    Patent number: 5608059
    Abstract: Ion-sensitive compounds have the formula A.sup.2+ B.sup.2- wherein A represents a cation capable of forming a receptor-substrate complex with an anion, and B represents one or more counter anions, the cation being an anion receptor of the formula ##STR1## wherein R.sup.1 and R.sup.2 are each independently a substituted or unsubstituted alkyl group, a substituted or unsubstituted aryl group or R.sup.1 and R.sup.2 taken together with the atoms separating them represent the atoms necessary to complete a (2)-cryptand; and,R.sup.3 and R.sup.4 are each independently H or a lower alkyl group having from 1 to 4 carbon atoms, or R.sup.3 and R.sup.4 taken together represent an ethylene bridging group.The compounds may be used for sensing anions.
    Type: Grant
    Filed: December 19, 1994
    Date of Patent: March 4, 1997
    Assignee: Eastman Kodak Company
    Inventors: Trevor J. Wear, Christopher P. Moore, Alistair J. Goulden, Paul D. Beer, Nicholas C. Fletcher