US4418108A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Composite roofing panel
Assignee: Owens Corning
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Filing: 1982-02-08
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Granted: 1983-11-29
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Expires: 2002-02-08
Abstract
Abstract A composite panel including a fibrous glass board and foamed-in-place plastic foam has a perforated sheet at the foam-fiberglass interface, there being at least two holes per square inch in the perforated sheet, the diameter of the holes being less than 0.06 of an inch, and the amount of open area represented by the holes being less than 1.5 percent of the total area of the sheet.
Inventors
- 👤 David C. K. Lin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 17:54
CPC Classifications
B; B32; B32B; B32B5/00; B32B5/18; B32B5/20; B32B17/00; B32B17/06; B32B17/066; B32B3/00; B32B3/26; B32B3/266; E; E04; E04B; E04B1/00; E04B1/62; E04B1/74; E04B1/76; E04B1/78; E04B1/80; E04C; E04C2/00; E04C2/02; E04C2/10; E04C2/24; E04C2/243; E04C2/246; E04D; E04D3/00; E04D3/35; E04D3/351; E04D3/354; B32B2315/00; B32B2315/08; B32B2315/085; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24273; Y10T428/24322; Y10T428/24331; Y10T428/24339; Y10T428/249921; Y10T428/249953; Y10T428/249955; Y10T428/249981; Y10T442/00; Y10T442/60; Y10T442/647; Y10T442/674
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
135 words
A composite panel for roof insulation, said panel comprising a fibrous glass board susceptible to penetration of foamable liquid thereinto when foamable liquid is placed on an upper surface thereof, a generally uniformly perforated sheet on the upper surface of the board for limiting penetration of foamable liquid thereinto during manufacture of the panel while allowing bonding of foam thereto at the perforations, and a layer of plastic foam foamed and cured in place from foamable liquid placed on top of the perforated sheet, the perforated sheet having at least two generally circular holes per square inch, the diameter of the holes of the perforated sheet being 0.46 of an inch or less, and the amount of open area represented by the holes being less than 1.5 percent of the total area of the sheet.
Claim 2
Dependent Claim
135 words
A composite panel for roof insulation, said panel comprising a fibrous glass board susceptible to penetration of foamable liquid thereinto when foamable liquid is placed on an upper surface thereof, a generally uniformly perforated sheet on the upper surface of the board for limiting penetration of foamable liquid thereinto during manufacture of the panel while allowing bonding of foam thereto at the perforations, and a layer of plastic foam foamed and cured in place from foamable liquid placed on top of the perforated sheet, the perforated sheet having at least two generally circular holes per square inch, the diameter of the holes of the perforated sheet being 0.46 of an inch or less, and the amount of open area represented by the holes being less than 1.5 percent of the total area of the sheet.
Claim 3
Dependent Claim
40 words
A panel as claimed in claim 1 wherein the holes of the perforated sheet are substantially 0.046 of an inch in diameter and there are approximately three holes per square inch, resulting in an open area of about 0.5 percent.
Claim 4
Dependent Claim
40 words
A panel as claimed in claim 1 wherein the holes of the perforated sheet are substantially 0.046 of an inch in diameter and there are approximately five holes per square inch, resulting in an open area of about 0.85 percent.
Claim 5
Dependent Claim
14 words
A panel as claimed in claim 1 wherein the perforated sheet is polyethyleneterephthalate film.
Claim 6
Dependent Claim
18 words
A panel as claimed in claim 4 wherein the film has a thickness of 0.0005 of an inch.
Claim 7
Dependent Claim
15 words
A panel as claimed in claim 1 wherein the perforated sheet is a thermoplastic film.
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) | 1986-11-28 | 1987-05-30 | 1987-11-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-11-28 | 1991-05-30 | 1991-11-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-11-28 | 1995-05-30 | 1995-11-29 | $7700.00 | Window Closed / Lapsed |