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:
Oct. 12, 1999
Filed:
Aug. 25, 1993
Applicant:
Inventor:
Parag G Mehta, Peabody, MA (US);
Assignee:
Other;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B32B / ;
U.S. Cl.
CPC ...
428195 ; 428690 ; 428917 ; 313503 ; 313504 ; 25230116 ; 25230121 ; 25230134 ; 25230135 ;
Abstract
Electroluminescent devices have, as the active layer, a polymer comprising a poly(3-substituted thiophene), the 3-substituent of which is an alkyl, cycloalkyl, alkoxy, cycloalkoxy, alkoxyalkyl, fluorocarbon, siloxyl or heteroorganic group, the poly(3-substituted thiophene) having a head-to-tail ratio of at least about 80 percent. Such devices give better electroluminescent performance than similar devices using a poly(3-substituted thiophene) having a lower head-to-tail ratio.