Why were patents important to the development of the film industry?

In the moment of Edison and Lumière, there were already numerous other types of movie sizes. This diversity of movie sizes and high demand for movie produced frenzy in the current business. Patents on the various sizes and styles of the film were intensifying as corporations attempted monopolies of this industry. To prevent the confusion of these courts, the leading nine corporations that were making cinema in 1909 decided to pool together their rights and produced the 35mm movie as the standard size (Rogge ). At that same year, it was assumed by both the French and the Germanic cinema associations as the necessary size for usage.

i think its d if im not mistaken