 |
|
|
|
|
|
 Title: |
US4462399:
Powered air respirator and cartridge
[ Derwent Title ]
|
| Country: |
US United States of America
|
| |
| Inventor: |
Braun, David L.; Lake Elmo, MN
|
| Assignee: |
Minnesota Mining and Manufacturing Company, St. Paul, MN
other patents from MINNESOTA MINING AND MANUFACTURING COMPANY (377880) (approx. 9,335)
News, Profiles, Stocks and More about this company
|
| Published / Filed: |
1984-07-31
/ 1981-10-02
|
| Application Number: |
US1981000307872
|
| IPC Code: |
Advanced:
A62B 18/04;
A62B 23/02;
IPC-7:
A61F 9/06;
A61M 15/00;
|
| ECLA Code: |
A62B18/04A; A62B23/02;
|
| U.S. Class: |
Current:
128/201.25;
055/497;
055/DIG.035;
128/201.24;
Original:
128/201.25;
128/201.24;
055/497;
055/DIG.35;
|
| Field of Search: |
128/205.12,205.29,201.12,201.23,201.24,201.25,201.29,206.19,206.16
002/171.3,424
055/103,131,132,385 R,385 F,497,DIG. 35,499
604/405,406
|
| Priority Number: |
| 1981-10-02 |
US1981000307872 |
|
| Abstract: |
A high efficiency rigid or semi-rigid air filter cartridge for use in the helmet of a powered air respirator comprising a lightweight, open-topped, trough-shaped frame having an entrance at one end for attachment to an air discharge port of a fan motor housing assembly, filter media sealed about its periphery to close said frame, said frame and said filter media enclosing a contaminated air plenum bounded by the inside surfaces of the bottom and side walls of said frame and the under surface of said filter media, such that contaminated air from said air discharge port is channeled under pressure through said plenum and distributed under pressure to and through said filter media and provides purified air, is disclosed. The filter media may be a sorbent particle loaded web, an electrically charged filter, or pleated fiberglass paper. A high efficiency powered air respirator for providing filtered air to a wearer, is also disclosed. The powered air respirator includes the rigid or semi-rigid air filter cartridge of the invention as well as improved sealing means between the respirator parts.
|
| Attorney, Agent or Firm: |
Sell, Donald M. ;
Smith, James A. ;
Sherman, Lorraine R. ;
|
| Primary / Asst. Examiners: |
Apley, Richard J.; Macey, Harry J.
|
| INPADOC Legal Status: |
Show legal status actions
Family Legal Status Report
|
| Designated Country: |
DE FR GB IT
|
| Family: |
Show 8 known family members
|
First Claim:
Show all 16 claims |
I claim:
1. A high efficiency rigid or semi-rigid air filter cartridge for use in the helmet of a powered air respirator, said air filter cartridge comprising:
- a lightweight, hollow frame having a closed bottom which is curved, side walls, an open top, and having filter media mounted across the top of said frame constituting the upper surface of said cartridge, said frame and said filter media forming a contaminated air plenum having one entrance to receive contaminated air into one end of said air filter cartridge from an air discharge port of a fan motor housing assembly, said filter media being sealed about the periphery of said open topped frame to close said frame, and said contaminated air plenum being bounded by the inner surfaces of the bottom and side walls of said frame and the inside surface of said filter media, contaminated air from said air discharge port being channeled under pressure through said entrance to said frame and said contaminated air plenum of said filter cartridge and distributed under pressure to and through said contaminated air plenum and said filter media to provide purified air.
|
| Background / Summary: |
Show background / summary
|
| Drawing Descriptions: |
Show drawing descriptions
|
| Description: |
Show description
|
| Forward References: |
Show 46 U.S. patent(s) that reference this one
|
|
