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.
Standard Bathtubs. The two most common tub sizes are 60 inches long by 30 inches wide and 60 inches long by 32 inches wide. A standard rectangular-shaped tub, however, will have a smaller dimensioned bathing well, measuring 55 inches by 24 inches at the top and narrowing to 45 inches by 22 inches at the very bottom.