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:
May. 17, 1983
Filed:
Aug. 06, 1981
Applicant:
Inventors:
Johann G Schulz, Pittsburgh, PA (US);
Daniel Margosian, Verona, PA (US);
Assignee:
Gulf Research & Development Company, Pittsburgh, PA (US);
Primary Examiner:
Int. Cl.
CPC ...
C07C / ;
U.S. Cl.
CPC ...
562410 ; 562407 ;
Abstract
A process for preparing a coal derivative comprising a mixture of monocyclic, polycyclic, multifunctional carboxylic acids which comprises contacting an aqueous slurry containing coal with aqueous nitric acid and then drying the resulting product to remove water therefrom.