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. 12, 1984
Filed:
Feb. 11, 1983
Applicant:
Inventors:
Marc E Parham, Sharon, MA (US);
Stephen A Spearman, West Warwick, RI (US);
Gleason O Cookson, Taunton, MA (US);
Assignee:
Ciba-Geigy Corporation, Ardsley, NY (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C07C / ;
U.S. Cl.
CPC ...
564428 ; 564437 ;
Abstract
Crystalline 5(6)-amino-1-(4-aminophenyl)-1,3,3-trimethylindane is made by crystallizing the diamino reaction mass from a toluene/heptane solution. The material has been previously purified through a combination of acetic acid washing and treatment with acidic clay. The diamino material, also known as DAPI, is a potential stabilizer, curing agent, and one of the monomers used to produce a polyimide resin.
Parham, Marc. (1984). Process for purification and isolation of diaminophenylindane (U.S. Patent No. 4454347). U.S. Patent and Trademark Office. https://idiyas.com/patent/badge/4454347
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile