In addition to adhering to the general requirements of patentability, the following must also be true:
Due to the importance of color rendition of plant patents, they are distributed to PTRCs and retained in paper format. They can be searched via the electronic databases--the USPTO’s PatFT (granted patents), AppFT (patent applications), PubEAST, and PubWEST search systems--and on the discontinued CASSIS USAPat (optical discs) (2000 – 2011) , however the images are only black and white. Plant patents were distributed on color microfiche from 1991 – 1999, which included the entire backfile.
The following libraries in the U.S. have digitized plant patents to make them publicly available:
The UCF Library has the color microfiche backfiles up to 1994 (U.S. Documents fiche, call number C 21.13:) , and the paper copies with color plates from November 1994 forward.
You can search for plant patents in the following databases :