US Patent 11187031 Fastening system and window shade including the same

A fastening system for a window shade includes a first and a second clipping base, and a first and a second clipping plate. In a first configuration, the first and second clipping bases are attached to each other with each of the first and second clipping plates respectively disposed between and in contact with the first and second clipping bases, whereby a first panel can be held between the first clipping base and the first and second clipping plates and a second panel can be held between the second clipping base and the first and second clipping plates. In a second configuration, the first and second clipping bases are attachable to each other without the first and second clipping plates, whereby a single panel of a window shade can be held between the first and clipping bases.