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:
Mar. 21, 1995
Filed:
Aug. 23, 1993
Applicant:
Inventors:
Shigeyuki Yamamoto, Hyogo, JP;
Hiroshi Adachi, Hyogo, JP;
Assignee:
Mitsubishi Denki Kabushiki Kaisha, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C08G / ;
U.S. Cl.
CPC ...
528 12 ; 528 14 ;
Abstract
High-purity silicone ladder polymer a weight average molecular weight of 600-1,000,000 and a molecular weight distribution of no more than 10 and it contains no more than 1 ppm each of sodium, potassium, iron, copper, lead and chlorine and no more than 1 ppb each of uranium and thorium. This silicone ladder polymer is very pure, has high molecular weight and yet can be produced easily. Hence, it can advantageously be used as a material for making surface protective or inter-level insulation films in semiconductor devices.