U.S., "... a new and useful process, machine, manufacture, or composition, or new and useful improvements ..." It is a patent application. On the other hand the law of nature, natural phenomena and abstract ideas within that definition, have been held, and can not be patent. For example, mathematical equations themselves are not patentable.
Of course, no law, particularly patent law, is not always as simple as that. Check out all the abstract concepts and / or the type of law based on fundamental rights. Acoustical, mechanical and electrical equipment is based on the phone. Some argue that the phone is still, as it is done in a unique and practical application of this law is not patentable.
Instead of trying to patent the telephone, if, Alexander Graham Bell voice signals are converted to electrical signals the idea of trying to protect, and then he went back to the audio signal. Discovery process, machine, or composition or production of print material that is easy to notice the law change. Read More
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