Patent · US Expired

Method of producing an electrically charged film

US6846449B2 · kind B2 · utility

12Cited by

220References

32Claims

0Family size

Assignee

S.C. Johnson Home Storage, Inc. · US

Inventors

Frederick H. Martin · Racine, US
Jose Porchia · Saginaw, US
Julie M. Grissmeyer · Racine, US

Key dates

Filing date	Sep 7, 2001
Grant date	Jan 25, 2005
Priority date	—
Expiry date	Sep 28, 2022

Classification

Technology area (CPC B)Performing Operations; Transporting
CPC primaryB29L2007/008
WIPO fieldOther special machines
WIPO sectorMechanical engineering

Abstract

A method of producing an electrically charged film includes the steps of forming a molten thermoplastic material into a web, electrically charging the web while the web is at a temperature substantially at or above a solidification temperature thereof, cooling the web below the solidification temperature thereof after charging and winding the web into individual rolls immediately following the cooling step.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.