Consider the research and development cost of a machine. Let's say in 2013, a prototype was manufactured. Then in 2014, a patent application was filed. On that same year, validation continued. Significant developments occurred until 2018. On 2019, the research was declared complete and a success.

Does the useful life begin on 2013 when the prototype was made, or on 2014 when the patent was filed, or on 2019 when the machine was perfected?

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    This is more of an economics question than a patent one. For sure there is value for the duration of the patent term. – Eric S Jun 17 at 12:20

Useful life begins with patent filing date since it can be beneficial for licensing agreement or selling the rights.

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