04174532 is referenced by 56 patents and cites 10 patents.

A portable lighting fixture for use with a patio umbrella and the like in which the umbrella is supported by a center pole having struts extending outwardly therefrom to the underside of the umbrella when the umbrella is in a raised position. A base has a slot therein extending inwardly from an edge of the base toward the center thereof for receiving the pole to removably install the base below the underside of the umbrella about the pole. The base is supported by the struts when installed. At least one electric light source is mounted on the base. Power is supplied from a source of electrical energy to the light source thereby to illuminate the area beneath the umbrella.

Title
Portable lighting fixture
Application Number
5/798769
Publication Number
4174532
Application Date
May 20, 1977
Publication Date
November 13, 1979
Inventor
Richard L Kelley
7 Elm Pl., Webster Groves, 63119
MO, US
Agent
Koenig Senniger Powers and Leavitt
IPC
F21V 21/08
F21V 33/00
View Original Source