Please note:
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Your provisional patent application must contain an exact description of your invention with all technical features that are necessary for the functioning of your invention. Features that you also intend to disclose on your website, in advertising brochures or in other presentations should be included in any case. Technical drawings are also good to supplement the description. In short, the more and more detailed you describe your invention, the better.
It can, but does not have to contain:
IMPORTANT. The priority date of your provisional patent application applies only to features that you actually disclose in your description. It is not possible to add features after the fact.