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Clarifications during amendments

Can one during amendments add clarifications, in particular to explain an algorithm executed by a micro processor. Can one add drawings to explain how the algorithm works. What section of the US ...
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Has the Borland 32-bit SEH patent expired? [duplicate]

In reference to the patent: US5628016. Is this patent expired? Can other people now implement SEH on 32-bit without opening themselves up to being sued?
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What if I use my algorithm, which is similar by 80% to the another already patented?

I'm developed an algorithm for constructing heat maps (eg, maps clicks heatmap) , going to implement. Found that there is already a patent for this method of visualization ...
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Idea of Suggesting Application by time

I have this idea in a very vague form which I have not seen implemented yet but maybe someone can tell me if it is out there already or not. It might not be worth a patent as its just an addition but ...
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Is (Google) PageRank invalidated by this econ. paper from 1940s?

Some early versions of PageRank are discussed the PageRank: Standing on the shoulders of giants My question is whether any of the prior art mentioned in the article would be sufficient to invalidate ...