Patents by Inventor John Christian Oppelt

John Christian Oppelt 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).

  • Heterocyclicamides of hindered 3,5-dialkyl-4-hydroxybenzoic acids and use as light stabilizers in polyolefins
    Patent number: 4066614
    Abstract: Compounds of the formula: ##STR1## WHEREIN R.sub.1 and R.sub.2 are each branch-chain alkyl of 3 to 8 carbon atoms and -Het is a nitrogen-containing heterocyclic moiety attached to the carbonyl carbon atom through a heterocyclic nitrogen are useful as light stabilizers in polyolefins. They may be prepared (a) by reacting the 3,5-dialkyl-4-hydroxybenzoyl chloride with the appropriate heterocyclic amine in the presence of an acid acceptor or (b) by reacting the corresponding benzoic acid with the appropriate heterocyclic amine in the presence of a carbodiimide as dehydrating agent.
    Type: Grant
    Filed: December 30, 1974
    Date of Patent: January 3, 1978
    Assignee: American Cyanamid Company
    Inventors: John Christian Oppelt, Peter Vincent Susi
  • N-(2,2-dimethyl-6,6-di(lower alkyl)-4-piperidinyl)-amides of hindered 3,5-dialkyl-4-hydroxybenzoic acids and use as light stabilizers in polyolefins
    Patent number: 4052361
    Abstract: Compounds of the formula: ##STR1## wherein R.sub.1 and R.sub.2 are each branch-chain alkyl of 3 to 8 carbon atoms and R.sub.3 and R.sub.4 are each alkyl of 1 to 4 carbon atoms are useful as light stabilizers in polyolefins. They may be prepared by reacting 3,5-dialkyl-4-hydroxybenzoic acid with 4-amino-2,2-dimethyl-6,6-di(lower alkyl)piperidine in the presence of a carbodiimide as dehydrating agent.
    Type: Grant
    Filed: December 30, 1974
    Date of Patent: October 4, 1977
    Assignee: American Cyanamid Company
    Inventors: Peter Vincent Susi, John Christian Oppelt
  • Ethanol- and substituted ethanolamides of hindered 3,5-dialkyl-4-hydroxybenzoic acids
    Patent number: 3992434
    Abstract: Compounds of the formula: ##SPC1##Wherein R.sub. 1 and R.sub. 2 are each branch-chain alkyl of 3 to 8 carbon atoms, R.sub. 3 is --CH.sub.2 CH.sub.2 OZ wherein Z is hydrogen or ##SPC2##And R.sub. 4 is hydrogen or R.sub. 3 are useful as light stabilizers in polyolefins. They may be prepared (a) by reacting the 3,5-di-alkyl-4-hydroxybenzoyl chloride with the appropriate amine in the presence of an acid acceptor or (b) by reacting the corresponding benzoic acid with the appropriate amine in the presence of a carbodiimide as dehydrating agent.
    Type: Grant
    Filed: December 30, 1974
    Date of Patent: November 16, 1976
    Assignee: American Cyanamid Company
    Inventors: John Christian Oppelt, Peter Vincent Susi
  • Alkylamides of hindered 3,5-dialkyl-4-hydroxybenzoic acids and use as light stabilizers in polyolefins
    Patent number: 3972927
    Abstract: Compounds of the formula: ##SPC1##Wherein R.sub.1 and R.sub.2 are each branch-chain alkyl of 3 to 8 carbon atoms and R.sub.3 and R.sub.4 are each hydrogen, alkyl of 1 to 18 carbon atoms, or cycloalkyl of 5 or 6 carbon atoms are useful as light stabilizers in polyolefins. They may be prepared (a) by reacting the 3,5-di-alkyl-4-hydroxybenzoyl chloride with the appropriate amine in the presence of an acid acceptor or (b) by reacting the corresponding benzoic acid with the appropriate amine in the presence of a carbodiimide as dehydrating agent.
    Type: Grant
    Filed: December 30, 1974
    Date of Patent: August 3, 1976
    Assignee: American Cyanamid Company
    Inventors: Peter Vincent Susi, John Christian Oppelt