3858573 is referenced by 25 patents and cites 5 patents.

An alveolar gas trap includes a small tubular reservoir having check valves at opposite ends and a mouthpiece so that when a person exhales through the mouthpiece, the exhalation gasses pass through the reservoir to the ambient with the last or alveolar gas being collected in the reservoir.

Title
Alveolar gas trap and method of use
Application Number
05/377,758
Publication Number
3858573
Application Date
July 9, 1973
Publication Date
January 7, 1975
Inventor
Williams Allan N
Ryan Donald F
Agent
Patnaude Edmond T
Assignee
SAID Ryan by said Williams
IPC
G01n 01/22
A61b 10/00
G01N 33/483
G01N 33/497
A61B 05/08
A61B 05/97
View Original Source