Can I re-apply for the same patent after it expires? How?

That would be a no.

That would be a no.

A U.S. Patent is a contract between the government and the inventor. The government grants to the inventor a limited monopoly, that is, the right to exclude all others from making, using, or selling the invention within the U.S. during the patent term. In exchange, the inventor gives the public a full and complete disclosure of the invention with a teaching of the design of the invention. The term of a Design Patent is 14 years from the date that the Patent Issues. Once the Patent expires, the invention enters the public domain and can be used by anyone. If you have made any improvements to the design, you can file for a Design Application for the improvements, but you will not be able to prevent another from using the old design.

No. Patents are only good for a specific length of time. After that anyone can use the design. However, you might want to see if your design now qualifies as a trademark. Trademark protection lasts as long as the owner continuously uses it in commerce.

NO. Once the patent expires - it enters the public domain - free for all to make, use and sell. Your design will expire 14 years after the patent was granted. The exact same invention cannot be re-patented. Also - a modified version will need to be not-obvious over your previous invention.