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What were improvements were made to this patent?

In reference to the patent: US 4,678,702 A What were improvements made to this patent later on?
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What happened to dependent claims if referred independent claim rejected?

I have an independent claim in my application for software patent that could be rejected on grounds like "abstract idea". There are a few dependent claims with limitations that hopefully pass the bar. ...
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Geomechanical Rock [closed]

How to determine total vertical stress sigma V due to weight of overburden rock, and minor horizontal total stress sigma hmin from density log.
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What is a PCT number?

What does a published PCT number mean exactly? (Of the form PCT/IB2011/nnnnnn). Does it grant any legal/intellectual rights in any way? Does it have any effect in this regard that a WO2013nnnnnnA1 ...