US 7810982

Patent Overview — US7810982B2

Title: Edge-lit optical system having optical elements on two surfaces

Patent number: US7810982B2 (application US12/364,637)

Inventors: Jeffery R. Parker, Timothy A. McCollum, Robert M. Ezell

Assignee/current assignee (as listed): Rambus Delaware LLC; original assignee Rambus International Ltd.

Key dates: Priority date 1999-02-23 (claimed from US09/256,275); filing date 2009-02-03; publication date 2010-10-12; anticipated expiration 2019-02-23. Legal status listed as "Expired - Fee Related."

Purpose and plain-language scope: The patent concerns an edge-lit optical system in which optical elements are disposed on two surfaces. Classifications place it in lighting refractors (F21V5/00) and light guides, including planar or plate-like light guides, means for coupling light in or out, redirecting means on the light-guide surface, and 2-D arrangements of prisms, protrusions, indentations, or roughened surfaces (G02B6/00–G02B6/0036). The prior-art keywords supplied are "light," "pattern," "optical elements," "optical," and "light source." From the classifications and title alone, the invention appears directed to distributing light in an edge-lit (side-lit) light guide where optical features on two surfaces redirect light, but the excerpt does not supply the claims, so the exact claimed scope is not established here.

Source: https://patents.google.com/patent/[US7810982](/patent/US7810982)/en

What this excerpt does not establish: It does not include the claims, written description, drawings, or detailed embodiments, so the precise metes and bounds of the invention cannot be stated. It also does not establish the identity or content of cited prior art, the examiner's reasoning, or the scope of any continuations or family members. The listed assignees and legal status are noted by the source as assumptions rather than legal conclusions. No litigation, ownership-transfer validity, patentability, or prior-art analysis is provided or implied here.