Fire resistant dual layer bimetallic door frame
US4674248A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 23, 1985 |
| Grant date | Jun 23, 1987 |
| Priority date | — |
| Expiry date | Dec 23, 2005 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE06B1/12
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A fire resistant dual layer, bimetallic door frame that comprises a fire resistant inner layer and an aesthetic outer layer. The inner layer, which is comprised of a first metallic material, has two parallel side portions and an upper horizontal portion. The outer layer, which is comprised of a second metallic material, has two parallel side portions and an upper horizontal portion, wherein each of the outer parallel side portions and the outer upper portion snugly receives the corresponding one of the inner parallel portions and the inner horizontal portion, whereby the bimetallic door frame is capable of resisting fire for at least 90 minutes.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.