Filter element

US4886058A · kind A · utility

Assignee

• Minnesota Mining and Manufacturing Company · US

Inventors

• Gerald M. Brostrom · Burnsville, US
• Daniel A. Japuntich · Windom, US
• Sabrina M. Yard · Windom, US

Key dates

• Filing date: May 17, 1988
• Grant date: Dec 12, 1989
• Expiry date: May 17, 2008

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S55/35
• WIPO field: Other consumer goods
• WIPO sector: Other fields

Abstract

A filter element adapted for attachment to a respirator face piece which includes front and rear walls of filter material, a breather tube, and a porous inner layer which maintains the front and rear walls in a spaced-apart relationship over substantially their entire area and which functions to evenly distribute air flow across the available filter element surface area.