Patent ID: 7694835

Claim:
A container neck and closure package, comprising: a container neck extending upwardly from a container and having an upper rim defining a neck opening, said container neck having an upper free end adjacent said upper rim and an opposing distal end; said container neck having a substantially vertical sidewall of a substantially constant thickness and at least one container neck thread helically extending from said sidewall; said at least one container neck thread having a drafted outer thread face extending from an inward upper position adjacent said container neck upper free end to an outward lower position adjacent said container neck distal end; said container neck thread having a first radial length adjacent said container neck upper free end and a second radial length adjacent said container neck distal end, wherein said container neck thread is increasing in radial length from said first radial length adjacent said container neck upper end moving downwardly along consecutive rotations to said second radial length adjacent said container neck distal end; a closure having a top wall, a substantially vertical axis depending perpendicularly from said top wall, and a skirt depending from said top wall, said skirt having an angled inner surface which is slanted with respect to said vertical axis; a closure thread extending helically along said angled inner surface of said skirt, said closure thread having a drafted inner thread face which is slanted with respect to said vertical axis; and said drafted outer thread face of said at least one container neck thread and said angled inner surface of said skirt maintaining a substantially constant distance from said angled inner surface of said skirt to said drafted outer thread face of said at least one container neck thread from an upper position of said vertical sidewall to a lower position of sidewall.