[bitwize]

Try putting your own beverage in bottles shaped like Coke's iconic curve bottle. Then you'll hear of it.

[mechanical_fish]

That's trademark law. Not the same thing as patent law, which in turn is not the same thing as copyright law.

[bitwize]

The design of a functional thing may be covered under a design patent; and indeed the Coke bottle shape is covered by such a patent.

Trademark law refers primarily to the design of nonfunctional things such as logos, the Deep Note sound, etc.