Biotech Values

[iwfal]

OT North - patent law questions, if I may:

1) Regarding change of disclosure on a Continuation-in-part: Why would someone change disclosure and thereby change the priority date. Isn't the primary purpose of using a CIP to gain the priority date of the parent?

2) Does a patent which changes disclosure (and thus gets a priority date different from the parent) have to state this on the patent?

3) Is it possible that a new claim on a CIP patent with a disclosure change will get the parental priority date? I.e. items in the same CIP patent get 2 different priority dates?

Just curious since I have a general interest in patent law.