They Invented What? (No. 173)

U.S. Pat. No. 4,320,756:  Fresh-air breathing device and method.

I claim:

1. A method for breathing fresh air in a room filled with toxic smoke comprising the steps of 
          inserting a breathing tube through a water trap of a toilet to expose an open end thereof to fresh air from a vent pipe connected to a sewer line of said toilet, and 
          breathing said fresh air through said breathing tube. 

2. The method of claim 1 further comprising the step of flushing said toilet prior to said inserting step. 

3. The method of claim 1 further comprising the step of blowing any water out of said tube subsequent to said inserting step and prior to said breathing step. 

4. The method of claim 1 further comprising the step of filtering the fresh air breathed through said tube.