“About” Not Indefinite

Substantial evidence supports jury’s conclusion that patent disclosing method of fracturing subterranean oil and gas wells is not invalid for indefiniteness or enablement on ground that it uses the term “about 0.06” in referring to concentration of polymer used in fracturing fluid, since person of skill in relevant art would understand range that term was intended to encompass.  (BJ Services Co. v. Halliburton Energy Services Inc., 67 USPQ2d 1692, CA FC, 8/6/03).


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