01104nas a2200133   4500008004100000245010600041210006900147520043500216100002200651700002300673700002400696700001900720856023100739       1999                        eng d00aUnited {States} {Patent}: 5974867 - {Method} for determining concentration of a laminar sample stream0 aUnited States Patent 5974867 Method for determining concentratio3 aMethods and apparatuses including programmed computers are provided for determining the initial concentration of diffusible particles in a sample stream introduced into a system wherein the sample stream which contains the diffusible particles flows in adjacent laminar flow with an indicator stream containing an indicator substance capable of exhibiting an observable change at a known concentration of the diffusible particles.1 aForster, Fred, K.1 aGalambos, Paul, C.1 aWeigl, Bernhard, H.1 aHoll, Mark, R.  uhttp://patft.uspto.gov/netacgi/nph-Parser?Sect1=PTO2&Sect2=HITOFF&p=1&u=%2Fnetahtml%2FPTO%2Fsearch-bool.html&r=35&f=G&l=50&co1=AND&d=PTXT&s1=%22Weigl%3B+Bernhard%22.INNM.&OS=IN/%22Weigl;+Bernhard%22&RS=IN/%22Weigl;+Bernhard%22