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Can I claim patent for my invention which is a little upgraded version of already patented devices. Moreover, I use same patented devices in my invention and add new functionalities to it. Is it worth patenting?

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Not if it is "just" an advancement.

Improvements to processes, machines, manufactures, or compositions of matter, are patentable but only if they are new and useful, and non-obvious (among other requirements like adequate disclosure etc.)

35 USC 101-103, 112

  • Good answer. This is to prevent things like changing a brush to having a rubber handle and taking credit. – Terry Sep 3 '15 at 15:37
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    Almost everything is an improvement on something else. "Just an enhancement" could be huge commercially and very novel and non-obvious. Or not. Not enough information in the question to judge. – George White Mar 6 '18 at 23:17

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