exist only as provided in the laws of sovereign states, and can be enforced only to the. extent that application has been made and a patent granted covering the territory of an. individual state. Patent rights are limited in duration, with the global standard being 20. years from the date of application. The new product, article of manufacture or process. described in the patent application must be something that has never been previously.
Typically, curtains are made of lighter weight fabric and give your windows a more homey look. There are three basic styles of curtains: panels, cafÃ© and tier; and you'll find variations on each style.
Here are some of our more popular sellers for stage curtains: 1  Commando Cloth â flame retardant, cotton, and heavy duty. 2  Duvetyn â flame retardant, cotton, economical, and great for masking. 3  Grand Drape Velours â flame retardant or inherently flame retardant, cotton or synthetic. Medium weight velour is great for long nap drapes.