The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 04, 1980
Filed:
Jan. 19, 1979
Applicant:
Inventor:
Layton A Wise, Washington, PA (US);
Assignee:
Mine Safety Appliances Company, Pittsburgh, PA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
A62B / ;
U.S. Cl.
CPC ...
12820226 ; 12820528 ; 222 835 ; 285302 ; 2851 / ; 277194 ; 277201 ; 277152 ; 277165 ;
Abstract
A breathing apparatus flow device has a hollow housing with a bottom opening to receive the upper end of a chemical canister neck, a side opening for connection to a breathing bag, and a top opening for connection to an exhalation tube. Slidably mounted in rigid downwardly extending tubular means in the housing is a hollow open end plunger that extends below the housing and is urged downwardly by a coil spring. A cylindrical resilient seal encircles the lower portion of the tubular means in engagement therewith and extends below it and inwardly into engagement with the plunger to seal the space between the tubular means and the plunger.