Patent ID: 8797648

Claim:
A portable light filtering device for windows comprising: a. an inner screen and an outer screen, each of said screens comprised of a polarized film material; b. said inner screen being secured to an inner mounting ring with an inner retaining ring and said outer screen being secured to an outer mounting ring with an outer retaining ring; c. said inner mounting ring having a top inner shoulder on an inner circumference of said inner mounting ring and said outer mounting ring having a bottom inner shoulder on an inner circumference of said outer mounting ring; d. a coupling ring having a coupling gap on an interior circumference of said coupling ring; e. said inner mounting ring and said outer mounting ring being in rotatable contact with each other; said top inner shoulder of said inner mounting ring and said bottom inner shoulder of said outer mounting ring being slideably engaged with said coupling gap of said coupling ring whereby each of said coupling rings are slideably engaged and whereby said inner screen and said outer screen can rotate relative to one another.