Light diffusing ring for wristwatch

Details Light diffusing ring for wristwatch Light diffusing ring for wristwatch

1988-12-16

1990-03-13

Lazarus, Ira S.

Illumination

Illuminated scale or dial

368 67, G01D 1128

Patent

active

049087398

ABSTRACT:
A light diffusing ring for positioning in a wristwatch about the circumference of a time display face thereof to illuminate the face. The ring is constructed of light transmitting material. The ring defines a top and a bottom wall, parallel to one another and an inner side wall. An elongated cavity is formed in an outer side wall of the ring and extends at least in one quarter of the circumference of the ring. The cavity has a cross-section dimension to receive at least two lamps therein and spaced from one another.

REFERENCES:
patent: 2259910 (1941-10-01), Rylsky
patent: 2703547 (1955-03-01), Hardesty
patent: 2850868 (1958-09-01), Kohler
patent: 2874268 (1959-02-01), Martin
patent: 2907869 (1959-10-01), Hudson et al.
patent: 3278740 (1966-10-01), Madansky
patent: 3701900 (1972-10-01), Thuler
patent: 3748456 (1973-07-01), Brien
patent: 3754130 (1973-08-01), Stone et al.
patent: 4250575 (1981-02-01), Flumm
patent: 4253171 (1981-02-01), Grinwald
patent: 4705407 (1987-11-01), Brien

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