Patent · US Expired

Particulate filtering

US4188197A · kind A · utility

57Cited by

9References

10Claims

0Family size

Assignee

Dennison Manufacturing Company · US

Inventors

Suresh D. Amberkar · Jamkhed, IN
Elwood F. Hansen · Allendale, US
David E. Hansen · Fairport, US

Key dates

Filing date	Oct 3, 1977
Grant date	Feb 12, 1980
Priority date	—
Expiry date	Oct 3, 1997

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10S55/02
WIPO fieldChemical engineering
WIPO sectorChemistry

Abstract

A filter bag for dry copiers, i.e. copiers which employ particulate toner material. The bag comprises a filter element and a protective cover of porous non-woven material which imparts negligible resistance to air flow.

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