The tech giant filed documents back in May with the World Intellectual Property Office (WIPO), which were finally published last month.
According to the plans, they are working on the design of a "dual-sided transparent smartphone" and a "foldable transparent smartphone".
Included is a sketch of the various ideas Sony has in mind for its future product.
Transparent phones will be a long way off just yet, as many brands are currently only just finding ways to hide the elements that make up a phone, such as front-facing cameras, ear-pieces and sensors, behind the screen.
Many foldable phones are currently in the works, however.
Most recently, Huawei promised to deliver a foldable smartphone within the next year.
The Chinese technology company are "already working" on releasing a smartphone with a fold-out screen, according to the firm's chief executive Richard Yu.
He said: "Why are you still using a computer? Probably because you find a smartphone display too small. We will change that. It is conceivable that you could fold out a display."
Richard then added that the company are hard at work on creating such a device, which he believes will be ready within a year.
His comments come just days after an executive at Huawei's South Korean rival company Samsung said it was time for his company to develop a foldable smartphone.
This suggests close competition between Huawei and Samsung, both of which are seemingly in a race to see who can produce and effective folding smartphone first.
Ben Stanton from market research firm Canalys said: "The industry is very close now to foldable phones becoming a commercial reality."
However, he also pointed out Richard's idea of replacing computers with foldable smartphones might not appeal to many customers.
Ben added: "It almost feels with foldable displays that technology companies are using this as something to highlight how innovative and technologically advanced they are ... without really considering the nuts and bolts that would make it a commercial success."