U.S. patents available from 1976 to present.
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Class 55/516 - Held between openwork


Subclass of Class 55 - Gas separation
Definition: Apparatus comprising at least two members which serve to
No. of patents: 42
Last issue date: 09/02/2008


  2  
NumberTitleIssue Date
4019509Self-rescue breathing apparatus
An impact resistant external casing is provided to enclose a canister containing a multi-layered chemical bed, with by-passes in each layer to accommodate the flow across and through the bed of exhaled breath which reacts with potassium superoxide in tabl...
04/26/1977
  2  
 
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