Patents by Inventor Athanasios Karydas

Athanasios Karydas 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).

  • Perfluoroalkyl substituted benzotriazoles
    Patent number: 4788292
    Abstract: Compounds of the formula ##STR1## wherein R.sub.1, R.sub.2, R.sub.3 and R.sub.4, independently of one another, represent hydrogen, hydroxy or halogen or are alkyl, alkoxy, alkanoyloxy, or alkanoylamino groups which are unsubstituted or substituted by alkoxy, hydroxyl, halogen, aryl, cycloalkyl, azacycloalkyl, cyano or by polyalkyleneoxy, or two or more of adjacent R.sub.1 -R.sub.4 together form one or more fused rings of 5-8 members each; R is alkylene of up to 16 carbon atoms which is unsubstituted or substituted by hydroxy, lower alkoxy, or halo and which may be interrupted by oxygen, sulfur, carboxamido, sulfonamido, aminosulfonyl, aminocarbonyl, carbonyloxy, sulfinyl, or sulfonyl; and R.sub.f is perfluoroalkyl or perfluoroalkoxyalkyl of 4 to 16 carbon atoms; or mixtures thereof. Such compounds are useful as oil soluble corrosion inhibitors.
    Type: Grant
    Filed: July 31, 1986
    Date of Patent: November 29, 1988
    Assignee: Ciba-Geigy Corporation
    Inventors: Kirtland P. Clark, Athanasios Karydas
  • Use of organic fluorochemical compounds with oleophobic and hydrophobic groups in asphaltenic crude oils as viscosity reducing agents
    Patent number: 4769160
    Abstract: A method of reducing a viscosity of asphaltenic crude oils by incorporating into said crude oil an effective viscosity reducing amount of an oil soluble organic compound having at least one oleophobic and hydrophobic fluoroaliphatic group, and optionally a low viscosity diluent, and compositions thereof.
    Type: Grant
    Filed: July 31, 1986
    Date of Patent: September 6, 1988
    Assignee: Ciba-Geigy Corporation
    Inventor: Athanasios Karydas
  • Use of organic fluorochemical compounds with oleophobic and hydrophobic groups in crude oils as antideposition agents, and compositions thereof
    Patent number: 4767545
    Abstract: A method of inhibiting the deposition of paraffin wax, asphaltene, or mixtures thereof in a crude oil contaminated with paraffin wax, asphaltene, or mixtures thereof and susceptible to such depositions comprising the step of incorporating into said crude oil an effective deposition inhibiting amount of an oil soluble organic compound having at least one oleophobic and hydrophobic fluoroaliphatic group, and antideposition stabilized crude oil compositions containing said compound, are disclosed.
    Type: Grant
    Filed: July 31, 1986
    Date of Patent: August 30, 1988
    Assignee: Ciba-Geigy Corporation
    Inventors: Athanasios Karydas, Thomas W. Cooke, Robert A. Falk
  • Sulfido- and sulfo-substituted perfluoroalkyl pyromellitates
    Patent number: 4647284
    Abstract: Perfluoroalkyl-alkyl-sulfide or sulfonyl-alkylene esters of meta- and para-pyromellitates, partially esterified with 3-chloro-1,2-propane diol, of the formulae: ##STR1## or mixtures thereof, wherein R.sub.f is perfluoroalkyl of 3 to 18 carbon atoms, andm is 0 or 2, are useful for incorporation into organic polymers to render them oil repellent and soil resistant.
    Type: Grant
    Filed: October 28, 1985
    Date of Patent: March 3, 1987
    Assignee: Ciba-Geigy Corporation
    Inventors: Athanasios Karydas, Robert A. Falk