In our days word Prozac is not just trademark but a word which gained secondary meaning , therefore I think it is fair to use it as book name. The...

If I submit my invention under a company name, would my partner own portion of that invention too?

You can file patent under Inventor name only. You can later assign that patent to your company. Whoever owns the company will own the patent.

Do I need to get an agreement from manufacturer to protect my design?

If you have copyright for your image, then derivative image in china should be covered as well, at least within USA.

Patent office keep charging me fee for extension I do not need

Try to contact Office of Data Management, they might help you to correct it.

Creating an LLC, corporation, or entity type, help with the protection of a provisional patent?

Normally LLC is instrumental for sale/assignment of a patent if there are multiple inventors. It provides no protection for your invention.

How can I protect a patent idea from being stolen, or imitated?

Filing patent is the best way to protect your invention. Trade secret is second choice. It all depends on what you have. Talk to lawyer and he will...

I make an item that health fitness centers are using I'm selling them over a year, patent was denied how can I protect it.

The question is when you filed for patent. There is statutory bar for filing patent application: if invention was in public use in that country for...