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What is the cost to challenge a patent? The issued patent is very broad

There is a recently issued patent US8371286 McCown that is so broad it includes grills, smokers, stoves and heaters. It takes the claims from US4169457 Christophel as its own. In fact the product is ...
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How can the challenge date of an application be extended?

The challenge on Microsoft's patent US 20130063492 states: Availability for Challenge: Open Until at least Sept 14, 2013 How is the "available for challenge" date obtained? What steps must we ...
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73 views

How does the public review process work for US patent applications?

I am aware of a patent application that has been filed that I wish to challenge. I know the application number, but the it was recently filed and is not publicly available for review on the USPTO ...
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Challenging a granted patent?

I found a patent which was granted but the product which is claiming the patent is different from the contents of the patent. How does one challenge the validity of the patent?