In reference to the patent: US20160144214
Dear Sir/Madam, I want to develop a new product. Can I use this open patent? Looking forward to your advise.
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As of now this is a pending patent application. Look at this question for more information.
This means it does not protect anything right now, but if it is granted, it will protect something. That protection applies backwards in time. If you infringe the claims of the future patent (in case it's granted) now, you might have to pay later.
-> No, using it now bears the risk of it becoming a patent in the future. It cannot yet be said what that patent will exactly protect, if anything, because the claims might change during the prosecution (=examination of the patent application).