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:
Aug. 07, 1990
Filed:
Mar. 17, 1989
Applicant:
Inventors:
Dennis E Jackman, Prairie Village, KS (US);
Gary W Combs, Blue Springs, MO (US);
Westphal Dietmar B, Remscheid, DE;
Assignee:
Mobay Corporation, Pittsburgh, PA (US);
Attorneys:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C07C / ;
U.S. Cl.
CPC ...
564 18 ;
Abstract
TCH is produced by a process which does not require expensive measures to remove hydrazine. In this process, hydrazinium dithiocarbazinate is reacted with an amine other than hydrazine or a strong base, optionally in the presence of water. It is preferred that a sulfur suppressing compound also be included in the reaction mixture. The precipitated TCH is removed from the reaction mixture to leave a mother liquor. Hydrazinium-dithiocarbazinate may then be added to the mother liquor. TCH precipitates and may be readily recovered.