Patent US4151894A successfully refreshed from Google Patents.
US4151894A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Insulating cover for pull down stair
Assignee: Individual
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Filing: 1977-10-17
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Granted: 1979-05-01
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Expires: 1997-10-17
Abstract
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.
Inventors
- 👤 Robert A. Edwards
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 10:12
CPC Classifications
E; E06; E06B; E06B5/00; E06B5/01
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
139 words
An insulating cover adapted to fit over an opening between the upper floor and the lower floor of a structure in which a folding stairway selectively provides access between the floors and wherein the bottom of said opening is closed by a trap door, when the folding stairway is in the folded position; said cover comprising an inverted box-like structure of a size such as to over lie said opening and having a top, front, rear and side walls; inner and outer handles fixed to said front wall; a pair of wheels on the outside of said rear wall and adapted to contact the surface of said upper floor when said cover is raised; said cover having a depth sufficient to receive therein said stairway in the folded position of the stairway between said top and said trap door.
Claim 2
Dependent Claim
139 words
An insulating cover adapted to fit over an opening between the upper floor and the lower floor of a structure in which a folding stairway selectively provides access between the floors and wherein the bottom of said opening is closed by a trap door, when the folding stairway is in the folded position; said cover comprising an inverted box-like structure of a size such as to over lie said opening and having a top, front, rear and side walls; inner and outer handles fixed to said front wall; a pair of wheels on the outside of said rear wall and adapted to contact the surface of said upper floor when said cover is raised; said cover having a depth sufficient to receive therein said stairway in the folded position of the stairway between said top and said trap door.
Claim 3
Dependent Claim
12 words
The invention as recited in claim 1, wherein said top is double-walled.
Claim 4
Dependent Claim
21 words
The invention as recited in claim 1, wherein the inner surface of said top and walls has a layer of insulation.
Claim 5
Dependent Claim
17 words
The invention as recited in claim 1, wherein said walls have sealing means on their lower edges.
Claim 6
Dependent Claim
21 words
The cover of claim 1 mounted over the said opening and housing the stairway in the folded position of the stairway.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-04-30 | 1982-10-30 | 1983-05-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-04-30 | 1986-10-30 | 1987-05-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-04-30 | 1990-10-30 | 1991-05-01 | $7700.00 | Window Closed / Lapsed |