Health Canada
Document 10055323
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1. Puff Count
I~ is generally accepted that at least about 8 puffs
are needed for a commercially acceptable cigarette. Resnik is
silent as to how to relate circumference (C) to number of puffs
(n). However, Resmik's Figure 1 relates SBRd {static burn re~e
distance in mm/min) to puff count, and Resnik's Fig. 8 relates
SBRd to C. Following Resnik's linear relationship shown on
Fig. 8., and likewise making a linear extrapolation from that~___ .~
figure as the Geneva cour~ did from Fig. 9, then Fig. 8 /o~~'~'~
to SBRd - 7.6 at 15 mm circumference and SBRd - ~ ~i
extrapolates
7.2 at 17 ~m circumference. Plot~ing those points against ~ ~
extrapolated
C = 15 mm and n - 6.73 at C - 17 ram. These predicted values" ~%0>~
are too low for commercially acceptable cigarettes, and are fa~~
below acEual values obtained following the Luke inventi : /, ...~
mm circumference and 6 73m._ ~
6";5sv;; 8;: :a~a~Uf~;f:°;o;517 .'circumference.
71
.°. . • ° r
Thus, Resnik's ,,predictions" as to puff count teach
away from the Luke invention and demonstrate that Luke's high
puff count is unexpected. At the same time, this extrapolation
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from Resnik's teachings demonstrates that even if a person
skilled in the art made the extrapolation from Figure 9, he
would not believe such an extrapolation to be of any value.
2. Total Tobacco Weight
Another aspect of the Luke invention is increased
efficiency of tobacco utilization. Total tobacco burned may be
calculated a number of ways. One is
nWp + (n-l) SBRm x time between puffs.
Where Wp = weight burned per puff
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Assuming n = 8, then n - 1 n 7. We further assume
that the time between puffs is about 1 minute (smoking machine
2 sec. puff, 58 sec. pause) and SBRm is at the minimum ~.~l
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For Wp, Yamamoto et. al., °Effect of Cigarette
Circumference or Weight Loss During Puffs and Total Delivery of
Tar and Nicotine', Beltra~e zur Tabakfo~schunq ~nternational,
Vol. 12. No. 5o Nov. 1984o pp. 259-269, states that Wp is
proportional to radius "r" [5]. From Yamamoto's Table 4, Wp
for C = 25 is about 26 mg (average of Virginia and American
blends). Table 5 adjusts for ash content to get total weight ~ ,
Io.s after th, ash is discarded, for n puff,: ~~<~
where A-, a,h content, abou~averag, for tO
W, for 15 mm is then expected to be about
Wp,s - W,,s z rl.~5 m 15.6 O
r25
and nWpls/(l-A) - 8(15.6)/(i-0.145) - 146 mg
and (n-I)SBR, - 7(60) , 420
or a total of 566 mg tobacco burned.
Allowing for a 10% butt (I0 ~m of I00 u=n for Ex. A &
B), total tobacco is 566/.9 - 629 mg/ Thus, Yamamoto p=edicts
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abou~ 629 m~ of tobacco is needed for 8 puffs at a
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cir~erence of 15 m. In fact, Ex. A of the invention at
15 ~ got 8.2 puffs, with only about half the total tobacco
weight, or 325 mg. This p~oves the invention's unexpected two
tins greater efficien~ of tobacco utilization, as set forth
in claim 16 of Re. 32,615.
4. Taste/Tar ~~ ~~
~other of the une~ected results of our invention is
that with half the tobacco (Ex. A versus ~. Orthodox),
sufficient tar is delivered in the mainstream smoke (T~) for
acceptable taste. Yamamoto states that Tt is proportional to
r2. Applying that ratio to the data in Re. 32,615 for Ex. A
and ~. orthodox, T, for 15 m would be expected to be:
- 14.5 (15z/25z) - 5.22
In fact, example A delivere~.6 ~ nearly twice as
~ch, proving again the une~ectef nature of our invention as
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