I'm suggesting that the USPTO people can't spot glaring errors of logic in a simple introductory paragraph of text that is devoid of complicated technical or legal language.
No wonder they grant applications for obvious programming techniques, like oh ... the use of XOR to draw a sprite on a black-and-white pixel display, such that if it is drawn again at the same location, it is erased, restoring the original background.
No wonder they grant applications for obvious programming techniques, like oh ... the use of XOR to draw a sprite on a black-and-white pixel display, such that if it is drawn again at the same location, it is erased, restoring the original background.