Patent · US Expired

Projection clock

US5247492A · kind A · utility

22Cited by
6References
3Claims
0Family size

Inventor

Key dates

Filing dateOct 13, 1992
Grant dateSep 21, 1993
Priority date—
Expiry dateOct 13, 2012

Classification

  • Technology area (CPC G)Physics
  • CPC primaryG04B19/34
  • WIPO fieldMeasurement
  • WIPO sectorInstruments

Abstract

A projection clock and in particular to one including a housing, the housing being provided at one end with a light bulb and a converging lens in alignment with the light bulb, and at the other end with a clock having a reflective dial with laterally inverted figures marking hours, and a cover engaged with the housing and having a diverging lens in alignment with the reflective dial of the clock and a converging member aligned with the light bulb.

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