Post level
US5207004A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Nov 19, 1991 |
| Grant date | May 4, 1993 |
| Priority date | — |
| Expiry date | Nov 19, 2011 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01C9/28
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A post level is defined by a pair of right-angle walls. A horizontal bubble vial is mounted in each wall, and a vertical bubble vial is mounted at the intersection of the walls. The vials are mounted in the interior of a pair of spaced protrusions formed in each wall, which define internal structure engaging and cradling an end of the vial without positively retaining the vial within the protrusion. The protrusions open onto the inner surface of the walls, and a retainer plate is positioned over the opening of the protrusions to retain the vials within the interior of the protrusions. The retainer plate is light-reflective to enhance visibility of the vial bubble.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.