The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 06, 1998
Filed:
Jun. 19, 1996
Applicant:
Inventor:
Stefan Weiss, Trostberg, DE;
Assignee:
SKW Trostberg Aktiengesellschaft, Trostberg, DE;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C07C / ;
U.S. Cl.
CPC ...
558-8 ;
Abstract
Disclosed is a process for the preparation of crystalline O-isopropylisourea hydrochloride, wherein cyanamide, chloroformamidinium chloride and isopropanol are reacted, an aprotic solvent preferably selected from the group consisting of ketones, ethers, esters and acetals, is added to the reaction mixture before, during and/or after the reaction and, optionally after cooling the reaction solution, the crystalline reaction product is separated off. O-isopropylisourea hydrochloride is obtained in a very pure and coarse crystalline form by the process of the invention.