Patent US4567074A successfully refreshed from Google Patents.
US4567074A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Insulating trap door cover
Assignee: Individual
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Filing: 1985-03-21
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Granted: 1986-01-28
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Expires: 2005-03-21
Abstract
Abstract A trap door cover consists of a generally rectangular frame. Molding strips are connected to the peripheries of the frame such that the finished frame resembles a picture frame. A slab of insulating material fits inside the frame. The door cover may be attached to the door by two spaced long screws through the insulating slab.
Inventors
- 👤 Stephen H. Litaker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 22:37
CPC Classifications
E; E04; E04F; E04F11/00; E04F11/02; E04F11/04; E04F11/06; E04F11/062; Y; Y10; Y10T; Y10T428/00; Y10T428/23; Y10T428/233; Y10T428/24; Y10T428/24479; Y10T428/24488; Y10T428/249921; Y10T428/249953; Y10T428/249987
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
114 words
An insulating cover adapted to fit over a trap door comprising: a. A slab of thermal insulating material made of rigid foam of a size sufficiently large to fit over the trap door; b. A frame having side walls and said side walls having a lower face and the inside dimensions of the frame are of the same size as are the outside dimensions of the slab; c. Molding means securely connected to the lower face of the side walls forming a lip extending inwardly and around the periphery of the frame whereby the slab is adhesively affixed to the lip; and d. Fastening means for removably attaching said cover to said trap door.
Claim 2
Dependent Claim
114 words
An insulating cover adapted to fit over a trap door comprising: a. A slab of thermal insulating material made of rigid foam of a size sufficiently large to fit over the trap door; b. A frame having side walls and said side walls having a lower face and the inside dimensions of the frame are of the same size as are the outside dimensions of the slab; c. Molding means securely connected to the lower face of the side walls forming a lip extending inwardly and around the periphery of the frame whereby the slab is adhesively affixed to the lip; and d. Fastening means for removably attaching said cover to said trap door.
Claim 3
Dependent Claim
18 words
An insulating cover of claim 1, wherein the molding means are decorative, beveled and mitered at the corners.
Claim 4
Dependent Claim
21 words
An insulating cover of claim 1, wherein fastening means is a pair of screws spaced at each end of the slab.
Claim 5
Dependent Claim
32 words
An insulating cover of claim 1, wherein the side walls are no more than 2" in height and 3/4" in thickness and the molding means are 11/2" wide and 1/2" in thickness.
Claim 6
Dependent Claim
23 words
An insulating cover of claim 4, wherein the side walls and the molding means are made of wood, and the slab is regular.
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) | 1989-01-27 | 1989-07-29 | 1990-01-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-01-27 | 1993-07-29 | 1994-01-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-01-27 | 1997-07-29 | 1998-01-28 | $7700.00 | Window Closed / Lapsed |