Patent · US Expired

Lighting display insensitive to extraneous light

US4180847A · kind A · utility

8Cited by
2References
7Claims
0Family size

Assignee

Inventors

Key dates

Filing dateSep 1, 1978
Grant dateDec 25, 1979
Priority date—
Expiry dateSep 1, 1998

Classification

  • Technology area (CPC G)Physics
  • CPC primaryG08B5/36
  • WIPO fieldControl
  • WIPO sectorInstruments

Abstract

For use with a lighted display which must be seen while energized in a high brightness environment, an arrangement which prevents extraneous light from entering the display for precluding ambiguity to a viewer as to whether or not the display is energized.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.