Insulating cover for pull down stair
US4151894A · kind A · utility
35Cited by
4References
5Claims
0Family size
Inventor
Key dates
| Filing date | Oct 17, 1977 |
| Grant date | May 1, 1979 |
| Priority date | — |
| Expiry date | Oct 17, 1997 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE06B5/01
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
An insulating cover larger than and fitting over the opening in an upper floor between the upper floor and an adjacent lower floor of a structure which has an open top, box-like shape with a pair of wheels on its back wall and front inside and outside handles. Optionally, the edges of the wall have an insulating gasket and the top of the cover has insulating means thereon. The cover is sufficiently deep to receive the folded stairs between its top and the trap door.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.