I'm trying to re-create the scientific calculator casio fx-570MS:
My app on Android will look like this:
The idea is I physically (no reverse engineering - that is no code touch, every code will be designed and written from scratch by me) observe the scientific calculator casio fx-570MS and re-create everything from scratch. I want to mimic the button layout and functions because I've used the casio fx-570MS all my youth that it has gotten into my blood. I don't know if this will violate copyright law or not, if it does, how can I get around it - e.g Can changing button order or button color & changing function order (the functions are still the same but instead of press 1 to activate, I switch to press 2) dodge the copyright law?
According to this Wikipedia page:
fx-991MS / 570MS / 115MS / 100MS / 95MS / 85MS / 350MS / 82MS (early 2000s)
So the calculator is first introduced in the early 2000s (probably between 2000 and 2004 because 2005 is mid-2000s). The pattern protection expires after 20 years so there is a big chance it's safe.