Lets say I file a provisonal patent for a method of making naptha but then broaden the final patent to methods of selectively making several petrochmicals.
If the new claims in the patent were not in the provisional then their priority date is the date of the actual patent while anything I discuss sufficiently in the original provisional patent enjoys the earlier date.
Suffice it to say that patent practice is very murky as subtle clarification in the final patent can be argued to be new material while sweeping "prophetic verses" showing where a technology could evolve past what is written can be argued to be supportive of future claims. (However, lets NOT get into continuation in part patents!).
News 
Market Data 
Discover 
AI
