Ceiling board aperture
US5231810A · kind A · utility
3Cited by
7References
5Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 23, 1992 |
| Grant date | Aug 3, 1993 |
| Priority date | — |
| Expiry date | Apr 23, 2012 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE04B9/0464
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
The invention is a ceiling board with a factory cut aperture therein. The edges of the ceiling board and/or the edges of a design cut in the face of the board are of the same or compatible design to that of the edge(s) of the aperture.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.