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.
Sash curtains are used to cover the lower sash of the windows. Rod pocket curtains have a channel sewn into the top of the fabric. A curtain rod is passed through the channel to hang. Thermal or Blackout curtains use very tightly woven fabric, usually in multiple layers. They not only block out the light, but can also serve as an acoustic or thermal dampener.