Invalidating a patent that has already been granted

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how to check the priority date of the patent?

IF I need to invalidate the patent that is CIP.Taking priority from CIP->CIP->DP->CP->Parent.
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How to check the Novality in the Patent?

When I read Patent, I don't get novality of that specially with CIP, CP applications. Is it by checking Backward Citations and compare with present claims?
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Call for Prior Art US Patent 7,888,125 (Theranos) Duke v. Stanford

CALL FOR PRIOR ART. Can you find better art doe this patent that claims novelty based on a comparison of device output with a known constant? U.S. Patent No. 7,888,125 (Theranos) Filed March 24, ...
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Is an invention considered “publicly disclosed” merely because it is described on a hosted service?

We are considering using a hosted SaaS collaboration website to discuss and roll out an invention. "We" includes only specific individuals who are all party to an appropriate NDA. So, I already know ...
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How to get a patent invalidated?

Recently while I was writing up a patent, I discovered that another person has written a patent that is so badly and vaguely worded that it could be used to cover my invention. Whereas I offer clear ...