Manufacturers
Currently there are several manufacturers of disc-binding systems. In the United States, it is Levenger (which owns the Circa disc line) and Rollabind. In Europe, it is a system called Atoma with a licensee in the United States called Myndology.
Atoma thanks its name to the inventors of the system, two French by the name of Andre Tomas and Andre Martin. In 1948, they sold their patent to Georges Mottart, who founded Papeteries G. Mottart n.v., exclusive producer of disc-binding systems for Europe until the mid-nineties, when the patent expired. Currently, Atoma sells between 1 and 1.5 million paper notebooks with original Atoma binding system.
Feldman filed for a patent in 1998 and obtained it, yet in 2006 it was found that he had copied the idea from another company, for which he used to work. He modified the system, but did not do what he claimed, and thus the patent was invalidated.
Staples is selling a disc bound system under the name of Arc under their M line of products.
Read more about this topic: Disc-binding