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:
Jun. 13, 1995
Filed:
Aug. 08, 1991
Applicant:
Inventors:
Thomas H Overgaard, Redford Township, MI (US);
Louis P Verduce, Wyandotte, MI (US);
Assignee:
Elf Atochem N.A., Inc., Philadelphia, PA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C07C / ; C07C / ;
U.S. Cl.
CPC ...
564-2 ; 564497 ; 564498 ; 564499 ;
Abstract
Tertiary-butyldiethanolamine subject to color deterioration is purified and stabilized against color formation by vacuum distilling said amine at a pressure within the range of 1 to 50 mm.Hg (1-50 torr) in the absence of a reducing agent,