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. These are general bathtub dimensions for both cast iron and fiberglass tubs.