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I was interested on Mobile Code/App generators and I landed on google patents. I checked patents related to Code Generators and I saw 4 or more entries that does similar things. So I'm curious why are these patents accepted, since there are others very similar. And if somebody files for a patent, how does one know he/she is not infringing?

Check the entries that is about programming code generation.

https://www.google.com/search?q=code+generator&hl=en&biw=360&bih=567&tbm=pts&ei=-nhlVdK9EIGxogTugIKgCg&start=40&sa=N&dpr=3

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    You have to read the patents, especially the claims, to determine if they are similar and how they differ. The title tells you nearly nothing. – Eric S Jan 21 '17 at 15:01
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I checked patents related to Code Generators and I saw 4 or more entries that does similar things. So I'm curious why are these patents accepted, since there are others very similar.

It depends how similar. All you've given us here is a list of patents containing the words "code generator". I doubt they all do the same thing in the same way.

And if somebody files for a patent, how does one know he/she is not infringing?

Filing a patent is never an act of infringement. You have to make, use or sell a patented invention to directly infringe. There are forms of indirect infringement, but none extend to mere communication of technical information, which is all that a patent application does.

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why are these patents accepted, since there are others very similar

They can't be exactly similar and granted at the same time. Anybody can file a patent for anything as long as it follows the basic criterias of patentability.

"Code generator" is just a term which might be getting used in completely different contexts in different patents. It is quite possible that these patents may be using a similar term to define different concepts or processes.

It is also possible that the patents you found might be continuations of each other, describing different aspects of a same process. Patents often get granted with just few claims being valid, while other gets rejected due to prior art.

And if somebody files for a patent, how does one know he/she is not infringing?

Answer of @atsby cleared this question pretty well. You are not infringing someone's patent just by filing a similar one. Your patent will get rejected as the other patent will be found by examiner. You have to make, sell, and earn profit from a patented invention in order to infringe.

Another thing, if you're concerned about how will you know that your product is infringing a patent or not. It's done by performing a "freedom to operate" search. You search the market if anybody has a patent on the product you are planning to sell, if you find a patent, you approach them for a license.

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