Patent · US Expired

Inflow and outflow HEPA vent filter for asbestos work areas

US4963170A · kind A · utility

68Cited by
10References
8Claims
0Family size

Assignee

Inventors

Key dates

Filing dateDec 4, 1989
Grant dateOct 16, 1990
Priority date—
Expiry dateDec 4, 2009

Classification

  • Technology area (CPC B)Performing Operations; Transporting
  • CPC primaryB01D46/10
  • WIPO fieldChemical engineering
  • WIPO sectorChemistry

Abstract

A HEPA vent filter device comprising a housing having openings in front and back walls, a partition in said housing between said front and back walls positioned at an angle from vertical and defining a framed opening, extensible curtain walls on the exterior of said housing between said front and back walls, a HEPA filter, pivots mounting said HEPA filter for movement toward and away from said framed opening so that air passing through said housing in a first direction moves said HEPA filter away from said framed opening and air passing through said housing in the opposite direction moves said HEPA filter into engagement with said framed opening and a sealing gasket thereon.

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