| Patent Number |
Title Of Patent |
Date Issued |
| 6806371 |
Preparation of substituted pyridine N-oxide compounds |
October 19, 2004 |
| A process for preparing substituted pyridine N-oxide compounds of the formula ##STR1##in which R1, R2, R3 and R4 are each H, a carboxyl group or a C.sub.1 -C.sub.12 -alkyl radical which may contain atoms from the group of N, O and S, or R1 and R2 and/or R3 and R4 together may each fo |
| 5597917 |
Method for the production of N-cyclic and N,N'-dicyclic ureas and their use as chemical solvents |
January 28, 1997 |
| A process for the dissolution of chemical compounds by use of ureas in which at least one of the urea's two nitrogen atoms is part of a non-aromatic ring which can be broken by an oxygen or sulphur atom as a chemical solvent, and a method of producing tri- or tetraalkylated ureas or |
| 5481035 |
Process for the preparation of asymmetrically substituted ureas, carbamates, thiocarbamates and |
January 2, 1996 |
| Process for the preparation of asymmetrically substituted ureas, carbamates, thiocarbamates or substituted isocyanates by reaction of an adduct of isocyanic acid and a tertiary amine with a primary and secondary amine, an alcohol, a thiol or a compound having one or two non-cumulated |
| 5414083 |
Method for the production of N-cyclic and N,N'-dicyclic ureas and their use as chemical solvents |
May 9, 1995 |
| A process for the dissolution of chemical compounds by use of ureas in which at least one of the urea's two nitrogen atoms is part of a non-aromatic ring which can be broken by an oxygen or sulphur atom as a chemical solvent, and a method of producing tri- or tetraalkylated ureas or |
| 5248755 |
Process for the preparation of asymmetrically substituted ureas, carbamates or thiocarbamates |
September 28, 1993 |
| Process for the preparation of asymmetrically substituted ureas, carbamates, thiocarbamates or substituted isocyanates by reaction of an adduct of isocyanic acid and a tertiary amine with a primary and secondary amine, an alcohol, a thiol or a compound having one or two non-cumulated |
| 5091553 |
Process for the preparation of substituted isocyanates |
February 25, 1992 |
| Process for the preparation of asymmetrically substituted ureas, carbamates, thiocarbamates or substituted isocyanates by reaction of an adduct of isocyanic acid and a tertiary amine with a primary and secondary amine, an alcohol, a thiol or a compound having one or two non-cumulated |
| 5043444 |
Process for the preparation of asymmetrically substituted ureas |
August 27, 1991 |
| Process for the preparation of asymmetrically substituted ureas by reaction of a gaseous mixture of isocyanic acid and ammonia having a temperature of 260.degree. to 600.degree. C. with a primary or secondary amine. |
