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.
For the width of the curtain, measure the entire length of the curtain rod and add 12 inches so the curtain can reach the wall on either side. Based on an average bathtub size of 60 inches long, plus an additional 12 inches, the average shower curtain width is 70 to 72 inches.