Patent ID: 6912793

Claim:
A method of making a vial having a cylindrical straight outer wall and a curved inner cavity comprising the steps of forming the entire outer wall in a straight cylindrical configuration, forming the entire curved inner cavity of the vial in a curve, said entire curved inner cavity and said entire outer straight cylindrical wall being formed simultaneously, the said entire curved inner cavity is simultaneously formed curved in a substantially uniform arc having an apex with opposed ends spaced from the apex and with opposed spaced sides at an angle of 90 degrees from the apex, the apex of the curved inner cavity is simultaneously formed closer to the straight cylindrical outer wall of the vial than the ends of the curved inner cavity, the said entire curved inner cavity is simultaneously formed substantially uniform in cross section throughout its length, planes tangent to the sides of the curved inner cavity are simultaneously formed parallel to each other and at right angels to a plane tangent to said apex, one end of said curved inner cavity being simultaneously formed terminating in an end wall perpendicular to said straight cylindrical outer wall, the other end of the curved inner cavity being simultaneously formed open.