Are all types of inventions patentable?
No, certain types of inventions can not be patented. For example, any invention that is not new or novel can not be patented. Simple discoveries of truths existing in nature are not patentable. Obscene inventions can not be patented. Inventions that threaten national security will not be patented. Inventions that are not useful, such as so-called perpetual motion machines are not patentable. Also, inventions that are simply an obvious combination of existing technology will not be granted a patent.