Sigma Labs Inc (SASI)

[GetRich1day]

A good reason why GE has the acoustic monitoring patent could be for the following reason

Large companies with a cash-cow product will just do about everything to avoid competition from entering the market. Many organizations are patenting every possible alternative way to manufacture a certain product. These alternative manufacturing ways will never be used by the patenting company. In fact, their only reason for existence is to block competitors from manufacturing a competing product through alternative processes.

https://www.creax.com/en/our-work/7-unconventional-reasons-for-filing-a-patent

That'll protect GE and SGLB's product for a good while