Are there any patents that would prevent someone from replicating the Tandy TRS-80 model 100 notebook computer, for instance putting a raspberry pi inside of it and then selling it?
It has been over 20 years since this product was on the market.
Here is an example of someone doing something similar: http://arstechnica.com/information-technology/2015/08/surfing-the-internet-from-my-trs-80-model-100/