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I have a limited budget and I am looking form a startup based on my idea. My idea is related to mobile (Android, iOS, etc) apps and a supporting website. It is a broad idea which can be implemented as several different features of my product. Do I have to file for separate provisional patents or can it all be described in just 1 application?

Example - Lets say Mark zuckerberg (Facebook) has the idea of "people communicating with other people in their networks online" . Can he file a single patent which describes 1) Posting on wall 2) Sending private message 3) Voice call 4) Video call 5) Chat

This is probably a bad example but I hope I got my point across. Thanks in advance!

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It sounds like all these ideas are very related and it would be normal to cover them in a single application.

However, in theory, you could put a door stop and a database and a rocket in one provisional application. It would be odd but would save you a little bit of money. There is no requirement for a 1:1 correspondence between provisional and regular non-provisional applications. Multiple non-provisionals can get the benefit of a single provisional and one non-provisional can get the benefit of multiple provisionals.

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Yes. I like to include as much as possible. You can take matter out when filing an original, but not add or claim matter which was not disclosed and described consistent with sec 112 in the original application claiming priority to the provisional.

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As pointed out in this answer

a provisional application becomes part of the file wrapper of any later-filed application which relies on it. When the later-filed application is published, the contents of the provisional application becomes publicly available with it.

So if you have additional ideas in the provisional they all become public at the time of publishing the patent A that takes priority from the provisional. Any ideas that have not been included in A are now publicly disclosed and therefore maybe cease to be patentable.

(Thanks for correction @George White).

Ceasing patentability of other ideas

I'm not a lawyer so am unsure which of the following possibilities apply, at the time of A being public:

  1. Any ideas which were not covered by A are retroactively public to the date of filing of A and so would be disclosed and unpatentable.
  2. Any ideas not covered by A but covered in patents applied for between filing A and publication of A are secure.
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  • They are available for public viewing at the time a patent that claims the benefit is published, not at the day of filing. It is usually 18 months from filing but can be delayed until and unless a patent is actually issued as long as no foreign filing is planned.
    – George White ♦
    Commented Jul 11 at 20:27

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