Part 1 Conducting Research. Understand what inventions or ideas are eligible for a patent. You can patent your idea if it's a process, a machine, an article of manufacture, a composition of matter, or an improvement of any of these.
Quick Answer. The standard size of a bathtub is 60 inches long, 32 inches wide and 18 inches tall. Standard-sized tubs are designed to fit into an alcove, surrounded by three walls. Alcove tubs are available in a wide variety of materials.
And the one element that sucks up the most space is the bathtub. Consider this: the average five-foot long bathtub displaces 13.35 square feet of floor space. A comparable corner shower stall unit (36x36) occupies only 9 square feet.