You can improve a patented item by getting a patent for the improvement. It is recommendable to hire a patent lawyer to help you form a base for proving the improvement.
Sholes was a U.S. mechanical engineer who invented the first practical modern typewriter, patented in 1868. I found nowhere that Edison improve the machine.
Duct tape...nuf said
The saxophone was invented by Adolphe Sax and he patented it in 1846.
No cheerleading is not patented, it is not able to be patented as it is not an object or product. However cheerleading related clothing items, designs, and toys can be patented
The first item that resembled a flat iron was made in 1872. However, it wasn't until 1909 that the first flat iron was patented.
The shape of an item can be patented. It is called a design patent. The most famous is probably the shape of the Coca Cola bottle.
Doritos were patented in 1966.
No, braille was never patented.
No one has patented the internet
An item becomes a promotional business item in Staples when many conditions are met. The item is often one from a company trying to advertise to a greater audience in order to improve visibility.
Atom patented the first chainsaw. They were also the ones who manufactured the first patented chainsaw. It was patented in 1972.
It is just a fun item. It doesn't improve your chances of getting an item, but it will show everyone you love the crafting tree.