Patents by Inventor John D. Spivack

John D. Spivack 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).

  • Patent number: 5319081
    Abstract: Lubricants stabilized against oxidative degradation by the incorporation therein of N-thiomethylphenothiazine derivatives, as well as certain phenothiazines within the indicated group.
    Type: Grant
    Filed: February 1, 1993
    Date of Patent: June 7, 1994
    Assignee: Ciba-Geigy Corporation
    Inventor: John D. Spivack
  • Patent number: 5211862
    Abstract: Lubricants stabilized against oxidative degradation by the incorporation therein of N-thiomethylphenothiazine derivatives, as well as certain phenothiazines within the indicated group.
    Type: Grant
    Filed: February 16, 1990
    Date of Patent: May 18, 1993
    Assignee: Ciba-Geigy Corporation
    Inventor: John D. Spivack
  • Patent number: 4835202
    Abstract: (Hydroxyphenyl)phosphine derivatives of the formula ##STR1## are effective in stabilizing organic materials against oxidative, thermal and actinic degradation, said derivatives being particularly effective as process stabilizers in organic materials containing phenolic antioxidants.
    Type: Grant
    Filed: November 20, 1987
    Date of Patent: May 30, 1989
    Assignee: Ciba-Geigy Corporation
    Inventors: Stephen D. Pastor, John D. Spivack, Edward T. Hessell
  • Patent number: 4808645
    Abstract: Dibenzodioxaphosphepin and dibenzodioxaphosphocin derivatives are prepared by reacting selected 2,2'-biphenols with phosphorus trichloride in an organic solvent and then reacting the intermediate formed with a 1,4-dihydroxy-2,2,6,6-tetraalkylpiperidine. The phosphites formed are useful as stabilizers of organic polymers and lubricating oils, especially as process stabilizers for polyolefins, elastomers, polyesters and polycarbonates.
    Type: Grant
    Filed: March 30, 1988
    Date of Patent: February 28, 1989
    Assignee: Ciba-Geigy Corporation
    Inventors: Ramanathan Ravichandran, John D. Spivack
  • Patent number: 4808644
    Abstract: Substituted (4-hydroxyphenylthioalkyl) derivatives of the formula ##STR1## are prepared by the reaction of the appropriate ring and hydroxybenzene thiol compounds and are useful stabilizers of organic materials.
    Type: Grant
    Filed: January 29, 1987
    Date of Patent: February 28, 1989
    Assignee: Ciba-Geigy Corporation
    Inventors: John D. Spivack, Ramanathan Ravichandran, Stephen D. Pastor
  • Patent number: 4730083
    Abstract: An improved process for the preparation of 3,5-dialkyl-4-hydroxybenzoic acid comprising the reaction of 2,6-dialkylphenol and carbon dioxide in the presence of a mono- or polyalkylene glycol ether.
    Type: Grant
    Filed: August 18, 1986
    Date of Patent: March 8, 1988
    Assignee: Ciba-Geigy Corporation
    Inventors: Stephen D. Pastor, John D. Spivack, Paul Odorisio
  • Patent number: 4713475
    Abstract: Long chain (4-hydroxyphenyl) propanoate derivatives of the formula ##STR1## are effective in stabilizing organic materials against oxidative and thermal degradation.
    Type: Grant
    Filed: June 12, 1986
    Date of Patent: December 15, 1987
    Assignee: Ciba-Geigy Corporation
    Inventors: John D. Spivack, David H. Steinberg, Paul A. Odorisio
  • Patent number: 4709050
    Abstract: Substituted-(hydroxyphenyl)-pyrrolidine-2,5-dione derivatives of the formula ##STR1## are prepared by the reaction of the appropriate maleimide and phenolic compounds and are useful as stabilizers for organic polymers.
    Type: Grant
    Filed: November 15, 1985
    Date of Patent: November 24, 1987
    Assignee: Ciba-Geigy Corporation
    Inventors: John D. Spivack, Stephen D. Pastor
  • Patent number: 4692532
    Abstract: Substituted (4-hydroxyphenylthioalkyl) derivatives of the formula ##STR1## are prepared by the reaction of the appropriate ring and hydroxybenzene thiol compounds and are useful stabilizers of organic materials.
    Type: Grant
    Filed: November 23, 1984
    Date of Patent: September 8, 1987
    Assignee: Ciba-Geigy Corporation
    Inventors: John D. Spivack, Ramanathan Ravichandran, Stephen D. Pastor
  • Patent number: 4692539
    Abstract: Pentaerythritol diphosphites corresponding to the formula ##STR1## being useful for stabilizing organic materials against thermal, oxidative and actinic degradation and a process for the preparation thereof.
    Type: Grant
    Filed: October 24, 1986
    Date of Patent: September 8, 1987
    Assignee: Ciba-Geigy Corporation
    Inventor: John D. Spivack
  • Patent number: 4642382
    Abstract: The title compounds correspond to the formula ##STR1## and are useful as stabilizers for organic polymers and lubricating oils to counteract the degradative effects of heat, light and air.
    Type: Grant
    Filed: July 18, 1985
    Date of Patent: February 10, 1987
    Assignee: Ciba-Geigy Corporation
    Inventors: John D. Spivack, Stephen D. Pastor, Paul Odorisio
  • Patent number: 4636573
    Abstract: Compounds of the formulae I and II ##STR1## wherein R.sup.1, R.sup.2, R.sup.3, R.sup.4 and R.sup.5 are independently hydrogen, alkyl of 1 to 18 carbon atoms, cycloalkyl of 5 to 8 carbon atoms, phenyl, phenyl substituted by alkyl of 1 to 18 carbon atoms, aralkyl of 7 to 9 carbon atoms or said aralkyl substituted by alkyl of 1 to 12 carbon atoms,R.sup.6 and R.sup.7 are independently alkyl having 1 to 30 carbon atoms, cycloalkyl of 5 to 8 carbon atoms, phenyl, phenyl substituted by alkyl of 1 to 18 carbon atoms, aralkyl of 7 to 9 carbon atoms or said aralkyl substituted by alkyl of 1 to 12 carbon atoms;A is a direct bond, a methylene or an ethylene radical,B is an alkanediyl radical of 2 to 10 carbon atoms, the radical of formula --CH.sub.2 CH.sub.2 --S--CH.sub.2 CH.sub.2 -- or of the formula III--CH.sub.2 CH.sub.2 --(O--CH.sub.2 CH.sub.2).sub.
    Type: Grant
    Filed: September 9, 1985
    Date of Patent: January 13, 1987
    Inventors: Stephen D. Pastor, John D. Spivack
  • Patent number: 4619957
    Abstract: Rigid polyvinyl chloride containing reduced amounts of titanium dioxide and a tin mercaptide thermal stabilizer, said polyvinyl chloride being stabilized against the adverse effects of ultraviolet radiation by the addition thereto of effective amounts of benzoate compounds.
    Type: Grant
    Filed: August 9, 1985
    Date of Patent: October 28, 1986
    Assignee: Ciba-Geigy Corporation
    Inventors: William J. Reid, Jean M. Zappia, Gerald A. Capocci, John D. Spivack
  • Patent number: 4612341
    Abstract: Organic materials are stabilized against thermal, oxidative and photo-degradation by incorporating therein an effective amount of a compound of formula I ##STR1## wherein T.sub.1 and T.sub.2 independently are alkyl, cycloalkyl, phenyl, aralkyl, T.sub.2 may also be hydrogen, T is alkyl, phenyl or substituted hydroxyphenyl, E is a direct bond, alkylene, cycloalkylene, phenylene or --CH.sub.2 CH(ST)CH.sub.2 --, T.sub.3 and T.sub.4 are independently hydrogen, alkyl or cycloalkyl; or together are alkylene, T.sub.5 is hydrogen, alkyl or phenyl, n is 1 or 2, t is 0 or 1, and t is 2-n. Polyolefins, ABS resins, natural and synthetic rubbers and polyesters are particularly well stabilized by the compounds of formula I.
    Type: Grant
    Filed: September 19, 1985
    Date of Patent: September 16, 1986
    Assignee: Ciba-Geigy Corporation
    Inventors: John D. Spivack, Stephen D. Pastor
  • Patent number: 4612393
    Abstract: Bis(substituted thioalkyl)hydroxylamine derivatives are effective in stabilizing polyolefin compositions containing a stabilizer or mixture of stabilizers selected from the group consisting of the phenolic antioxidants, the hindered amine light stabilizers, the alkylated hydroxybenzoate light stabilizers, the ultraviolet light absorbers, the organic phosphorus compounds, the alkaline metal salts of fatty acids and the thiosynergists, against degradation upon high temperature extrusion, exposure to the combustion products of natural gas, gamma irradiation or upon storage for extended periods.
    Type: Grant
    Filed: April 29, 1985
    Date of Patent: September 16, 1986
    Assignee: Ciba-Geigy Corporation
    Inventors: Ramanathan Ravichandran, John D. Spivack
  • Patent number: 4605692
    Abstract: Hydroxyphenylthio-substituted phosphites of the formula ##STR1## prepared by the reaction of the appropriate phosphorus and phenol compounds, said phosphites being useful as stabilizers of organic polymers and lubricating oils to counteract the degradative effects of light, heat and air.
    Type: Grant
    Filed: December 17, 1984
    Date of Patent: August 12, 1986
    Assignee: Ciba-Geigy Corporation
    Inventors: John D. Spivack, Ramanathan Ravichandran
  • Patent number: 4582870
    Abstract: Hindered silane compounds of the formula ##STR1## are prepared by the reaction of the appropriate silane and phenol compounds, said hindered silanes being useful as stabilizers of organic polymers such as polyolefins, vinyl halide polymers, elastomers, polyesters and polycarbonates.
    Type: Grant
    Filed: January 7, 1985
    Date of Patent: April 15, 1986
    Assignee: Ciba-Geigy Corporation
    Inventors: John D. Spivack, Stephen D. Pastor
  • Patent number: 4560799
    Abstract: Organic materials are stabilized against thermal, oxidative and photo-degradation by incorporating therein an effective amount of a compound of formula I ##STR1## wherein T.sub.1 T.sub.2 independently are alkyl, cycloalkyl, phenyl, aralkyl, T.sub.2 may also be hydrogen, T is alkyl, phenyl or substituted hydroxyphenyl, E is a direct bond, alkylene, cycloalkylene, phenylene or --CH.sub.2 CH(ST)CH.sub.2 --, T.sub.3 and T.sub.4 are independently hydrogen, alkyl or cycloalkyl; or together are alkylene, T.sub.5 is hydrogen, alkyl or phenyl, n is 1 or 2, t is 0 or 1, and t is 2-n. Polyolefins, ABS resins, natural and synthetic rubbers and polyesters are particularly well stabilized by the compounds of formula I.
    Type: Grant
    Filed: February 3, 1984
    Date of Patent: December 24, 1985
    Assignee: Ciba-Geigy Corporation
    Inventors: John D. Spivack, Stephen D. Pastor
  • Patent number: 4559379
    Abstract: The title compounds correspond to the formula ##STR1## where n is 1 and are characterized in that at least one of A, X or Y contains a group of formula ##STR2## these compounds being useful as stabilizers for organic polymers and lubricating oils to counteract the degradative effects of heat, light and air.
    Type: Grant
    Filed: February 5, 1985
    Date of Patent: December 17, 1985
    Assignee: Ciba Geigy Corporation
    Inventors: John D. Spivack, Stephen D. Pastor
  • Patent number: 4555541
    Abstract: Rigid polyvinyl chloride containing reduced amounts of titanium dioxide and a tin mercaptide thermal stabilizer, said polyvinyl chloride being stabilized against the adverse effects of ultraviolet radiation by the addition thereto of effective amounts of mono- and dibenzoate compounds.
    Type: Grant
    Filed: February 13, 1984
    Date of Patent: November 26, 1985
    Assignee: Ciba-Geigy Corporation
    Inventors: William J. Reid, Jean M. Zappia, Gerald A. Capocci, John D. Spivack