Can we add some extra features to the patent of the system which were missed in the provisional patent?
<p>I filed a provisional patent for a machine about 6 months ago. But as of now the outcome of the machine is same but the method to achieve that outcome has been changed a bit(i.e some of the features have been added but the final result remains the same).</p>
<p>In the description section of the provisional patent those features have not been added.</p>
<p>Will I be able to add those feature in the patent or my provisional patent will become invalid?</p>

<p>As mentioned in a comment, a non-provisional application you file within a year of the provisional application that gets the benefit of the provisional is not at all constrained by the content of the provisional. However, for a claim in the non-provisional to actually get the benefit of the filing date of the provisional, the provisional needs to fully support that claim. It can turn out that some claims get the earlier date and some do not. The criteria for the level of support is not lessened due to it being a provisional.</p>
<p>A non-provisional can get the benefit of multiple provisional so you can file a second provisional right away that adds the new material and when the year is approaching you can file a non-provisional that claims benefit from both.</p>

patents