Illuminated ruler
US7134214B1 · kind B1 · utility
6Cited by
10References
7Claims
0Family size
Inventor
Key dates
| Filing date | May 18, 2005 |
| Grant date | Nov 14, 2006 |
| Priority date | — |
| Expiry date | May 21, 2025 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01B3/04
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An illuminated ruler including a light transmissive bar having opposed ends. An opaque film bearing printed indicia in the form of ruled markings is affixed to the bottom of the light transmissive bar. A light-emitting diode is embedded within the light transmissive bar for illuminating the ruled markings. A battery is carried atop one end of the bar and is connected to the light-emitting diode for energizing and illuminating the light-emitting diode.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.