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:
Feb. 23, 1999
Filed:
Feb. 25, 1997
Applicant:
Inventors:
Assignee:
Hoechst Diafoil GmbH, Charlotte, NC (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B29C / ;
U.S. Cl.
CPC ...
524425 ; 2642902 ; 428480 ; 524430 ; 524447 ;
Abstract
The invention relates to a biaxially oriented polyester film having a roughness, on at least one film surface, of R.sub.z greater than 1.0 .mu.m (Ra is greater than 0.1 .mu.m), a dielectric strength (AC) greater than 220 kV/mm (the DC dielectric strength is greater than 500 kV/mm) and a migrating fraction in the film of less than 18 .mu.S/cm based on a mass of added particles in a polyester volume of 100 cm.sup.3. The film is particularly suitable for oil-impregnated capacitors.