Dual lifting manhole cover
US7905679B2 · kind B2 · utility
3Cited by
13References
12Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 12, 2007 |
| Grant date | Mar 15, 2011 |
| Priority date | — |
| Expiry date | Aug 8, 2029 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/7021
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A one-piece, unitary manhole cover has dual lifting ports that drain through the outer circumferential edge of the cover. A lifting channel runs from the interior of the upper face out to the outer circumferential edge. A lifting bar spans the lifting channel and defines an ergo lifting port and a pry bar lifting port. Both the ergo lifting port and the pry bar lifting port drain through the outer circumference of the manhole cover.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.