The definition of a patent is :
“A government authority or license conferring a right or title for a set period, especially the sole right to exclude others from making, using, or selling an invention.“
US Patent Law
In the US, patent law is set out in the Code of Federal Regulations | govinfo, Title 35, Chapter Section 10, Paragraph 101:
“Whoever invents or discovers any new and useful process, machine, manufacture, or composition of matter, or any new and useful improvement thereof, may obtain a patent therefor, subject to the conditions and requirements of this title.“
EU Patent Law
In the EU, a patent is described as a legal right:
“A patent is a legal title which protects a technical invention for a limited period. It gives the owner the right to prevent others from exploiting the invention in the countries for which it has been granted.“
The Business Dictionary gives perhaps the best definition when it comes to the question of GS-441524 ownership:
“Limited legal monopoly granted to an individual or firm to make, use, and sell its invention, and to exclude others from doing so. An invention is patentable if it is novel, useful, and non-obvious.“