Universal world clock
US5146436A · kind A · utility
Inventor
Key dates
| Filing date | Aug 9, 1991 |
| Grant date | Sep 8, 1992 |
| Priority date | — |
| Expiry date | Aug 9, 2011 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG04B19/223
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A universal world clock (10) for indicating universal standard and fast time at any geographical location in the world. A south polar projected world map superimposed onto a manually rotatable map disk (14) is divided with twenty-four time zone indicator lines (20) representing the time zones of universal time, the map disk (14) being positioned such that the user's geographic location is vertically oriented to represent map north, and the map disk (14) being further positioned so that the time zone indicator lines (20) are aligned with time zone pointers (22) located on a separate zone pointer disk (16) which is fixed in position over the map disk (14). A time disk (18) having hour indicators differentiated by a.m. and p.m., and having a shaded portion (32) representing night is positioned over the zone pointer disk (16) and stepped counterclockwise each hour in increments of fifteen degrees of rotation thereby positioning the hour indicators (30) over the time zone pointers (22), each step representing one time zone. The clock also includes indicators for displaying minutes and seconds.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.