To be the owner of a particular invention patent should be filed according to the procedure in patent office. A U.S. patent for an invention is the grant of a property right to the inventor(s), issued by the U.S. Patent and Trademark Office.
A patent application is a legal document and you cannot expect to "spend one evening filling it out," the better written the patent, the better the protection your patent will produce.
The right conferred by the patent grant is, in the language of the statute and of the grant itself, "the right to exclude others from making, using, offering for sale, or selling" the invention in the United States or "importing" the invention into the United States. To get a U.S. patent, an application must be filed in the U.S. Patent and Trademark Office.
The provisional application must be made in the name(s) of all of the inventor(s). It can be filed up to 12 months following the date of first sale, offer for sale, public use, or publication of the invention. (These pre-filing disclosures, although protected in the United States, may preclude patenting in foreign countries.)