Dark-banded vial for use with level
US6957494B1 · kind B1 · utility
10Cited by
13References
13Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Apr 16, 2004 |
| Grant date | Oct 25, 2005 |
| Priority date | — |
| Expiry date | Apr 16, 2024 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01C9/32
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A vial, level including such vial, and method of using such level are disclosed. The vial comprises a body having first and second ends, a midpoint, and interior and exterior surfaces, at least one marker ring connected with respect to the body, a bubble positioned in the cavity and defined by an interface, and first and second dark-colored bands circumscribing the cavity. The vial enhances the visibility of the bubble through the reflection of the first and second bands on the interface such that the interface along the perimeter of the bubble appears dark-colored.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.