Screw on dispensing closure with structure for preventing removal

A container assembly, comprising:

• a container having a threaded finish portion;
• and
• a plastic dispensing closure mounted on said container, said closure comprising
• a closure main body that is screwed on to said container, said closure main body having an orifice for dispensing a substance from said container and a downwardly depending skirt portion having an inner surface on which at least one interior thread is defined that is engaged with said threaded finish portion of said container;
• and
• flow control means for opening and closing said orifice;
• and
• retention means on said closure main body that is engaged with the container in such a manner as to frustrate efforts that may be made to unscrew the closure from the container.

A container, comprising:

• a main body portion;
• a threaded finish portion;
• and
• an annular transfer ring positioned adjacent to said threaded finish portion, and wherein said annular transfer ring has a notched defined therein for engaging a screw on type closure.

A screw on plastic dispensing closure for a container, comprising:

• a closure main body that is adapted to be screwed on to a container, said closure main body having an orifice for dispensing a substance from the container and a downwardly depending skirt portion having an inner surface on which at least one interior thread is defined for engaging threading on the container;
• flow control means for opening and closing said orifice;
• and
• retention means on said closure main body for engaging the container in such a manner as to frustrate efforts that may be made to unscrew the closure from the container after the closure has been screwed on to the container.