World clock with synchronous display
US6275449A · kind A · utility
29Cited by
19References
6Claims
0Family size
Inventor
Key dates
| Filing date | Aug 7, 1998 |
| Grant date | Aug 14, 2001 |
| Priority date | — |
| Expiry date | Aug 7, 2018 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG04B19/228
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A world clock includes a map with markings arranged to indicate time zones for actual geographic locations and a single-row table having 24 columns for correlating the markings with hour markings on a belt. The belt is driven by a controller to move one column every hour, with stoppage of the belt below the next column being controlled by a light sensor arranged to sense blank spaces on the belt between the hour markings.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.