US 4751615

Patent Overview: US4751615A — "Page Light"

Bibliographic data (per supplied source):

• Title: Page light
• Patent number: US4751615A
• Application number: US06/893,972
• Inventor: Martin Abrams
• Original assignee: International Marketing Concepts, Inc.
• Priority date / filing date: 1986-08-07
• Publication (grant) date: 1988-06-14
• Later recorded assignee: U.S. Acrylic, Inc. (assignment recorded 1989-02-27, per the source's transaction listing)
• Legal status: Expired – Lifetime; anticipated expiration 2006-08-07
• Source: https://patents.google.com/patent/[US4751615](/patent/US4751615)/en

Purpose and plain-language scope (based only on the supplied text):
The device is a portable, personal reading/writing light intended to illuminate one or two pages while minimizing light spilling onto adjacent areas. It is a tapered, wedge-shaped transparent body (e.g., acrylic or lucite) with opposed major planar surfaces, side walls, and an end wall. A low-powered bulb sits in a notch/opening at the thicker end; the curved notch wall is described as generally equidistant from the light source to reduce reflection. The tapered body is said to provide controlled, generally uniform illumination of a work surface contacting a major surface—an effect the text says parallel major surfaces would not achieve. The taper (included angle) is stated as somewhat greater than two degrees; example thicknesses are about 375 thousandths of an inch at the thick end and about 60 thousandths at the thin end. Sides are configured/treated to maximize internal reflection and minimize outward transmission. A discontinuity is placed between the light source and the body portion contacting the work surface. The text states the design uses few parts, no moving components, and avoids the roughened-surface approach because scoring would prevent reading through the device.

What the excerpt does not establish:
The supplied text is marked as an excerpt with omitted material, and it includes no claims, no complete drawing descriptions, and no full specification. It therefore does not establish the precise claimed scope, all described embodiments, detailed electrical specifications, or the content of any figures. No conclusions about validity, prior-art effect, or ownership beyond the recorded assignments listed are drawn here.