Patents by Inventor Ivan Joseph Bolton

Ivan Joseph Bolton 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).

  • 1,3-Diaryl-2-pyrazoline derivatives
    Patent number: 4085101
    Abstract: Disclosed are compounds of formula I, ##STR1## in which either R.sub.1, R.sub.2 and R.sub.3, which may be the same or different, each signifies a hydrogen atom, a chlorine or fluorine atom, an alkyl radical of 1 to 4 carbon atoms, an alkoxy radical of 1 to 4 carbon atoms, a cyano group, a group --SO.sub.3 M, an unsubstituted phenyl radical or a phenyl radical substituted by up to 2 substituents selected from chlorine, fluorine, alkyl of 1 to 4 carbon atoms, alkoxy of 1 to 4 carbon atoms and the group --SO.sub.3 M, with the proviso that only one of R.sub.1, R.sub.2 and R.sub.3 signifies an unsubstituted or substituted phenyl radicalOr two of R.sub.1 , R.sub.2 and R.sub.3, together, form a methylenedioxy group, the other of R.sub.1, R.sub.2 and R.sub.3 having one of the above significances,R.sub.4 signifies a hydrogen atom, a chlorine or fluorine atom, an alkyl radical of 1 to 4 carbon atoms or an alkoxy radical of 1 to 4 carbon atoms,R.sub.
    Type: Grant
    Filed: May 5, 1976
    Date of Patent: April 18, 1978
    Assignee: Sandoz Ltd.
    Inventors: Alec Victor Mercer, Peter Stuart Littlewood, Ivan Joseph Bolton, Fritz Fleck
  • 1,3-Diphenyl-4 or 5-sulphoalkyl pyrazolines
    Patent number: 4082746
    Abstract: Disclosed are anionic optical brightening agents, such agents being 1,3-diphenyl pyrazolines characterized by having, in the 4- or 5-position of the pyrazoline ring, a sulphoalkyl substituent, their production and use.
    Type: Grant
    Filed: September 23, 1976
    Date of Patent: April 4, 1978
    Assignee: Sandoz Ltd.
    Inventors: Ivan Joseph Bolton, Alec Victor Mercer
  • 1,3-Diaryl-2-pyrazoline derivatives
    Patent number: 4003889
    Abstract: Disclosed are compounds of formula I, ##STR1## in which either R.sub.1, R.sub.2 and R.sub.3, which may be the same or different, each signifies a hydrogen atom, a chlorine or fluorine atom, an alkyl radical of 1 to 4 carbon atoms, an alkoxy radical of 1 to 4 carbon atoms, a cyano group, a group --SO.sub.3 M, an unsubstituted phenyl radical or a phenyl radical substituted by up to 2 substituents selected from chlorine, fluorine, alkyl of 1 to 4 carbon atoms, alkoxy of 1 to 4 carbon atoms and the group --SO.sub.3 M, with the proviso that only one of R.sub.1, R.sub.2 and R.sub.3 signifies an unsubstituted or substituted phenyl radical,Or two ofR.sub.1, r.sub.2 and R.sub.3 together form a methylenedioxy group, the other of R.sub.1, R.sub.2 and R.sub.3 having one of the above significances,R.sub.4 signifies a hydrogen atom, a chlorine or fluorine atom, an alkyl radical of 1 to 4 carbon atoms or an alkoxy radical of 1 to 4 carbon atoms,R.sub.
    Type: Grant
    Filed: June 17, 1974
    Date of Patent: January 18, 1977
    Assignee: Sandoz Ltd.
    Inventors: Ivan Joseph Bolton, Alec Victor Mercer, Fritz Fleck
  • 1,3-Diphenyl pyrazolines
    Patent number: 3997556
    Abstract: Disclosed are anionic optical brightening agents, such agents being 1,3-diphenyl pyrazolines characterized by having, in the 4- or 5-position of the pyrazoline ring, a sulphoalkyl substituent, their production and use.
    Type: Grant
    Filed: August 4, 1975
    Date of Patent: December 14, 1976
    Assignee: Sandoz Ltd.
    Inventors: Ivan Joseph Bolton, Alec Victor Mercer
  • Pyrazoline derivatives
    Patent number: 3939154
    Abstract: The invention relates to optical brightening agents.
    Type: Grant
    Filed: January 24, 1974
    Date of Patent: February 17, 1976
    Assignee: Sandoz Ltd., (Sandoz AG)
    Inventors: Ivan Joseph Bolton, Fritz Fleck, Alec Victor Mercer