Patent US4233357A successfully refreshed from Google Patents.
US4233357A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Laminated insulating board
Assignee: Coal Industry Patents Ltd
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Filing: 1979-09-06
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Granted: 1980-11-11
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Expires: 1999-09-06
Abstract
Abstract An insulating board of excellent properties is made from a core of foamed phenol-formaldehyde resin which has a closed cell content of at least 85%, laminated on at least one face using a water-based natural rubber latex adhesive with a glass fibre tissue or cloth. The laminate has good fire resistance and can be bonded to roofs etc. using hot bitumen.
Inventors
- 👤 Rodney Taylor
- 👤 Robert J. Pragnell
- 👤 John P. Sheppard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 15:47
CPC Classifications
B; B32; B32B; B32B5/00; B32B5/18; B32B27/00; B32B27/12; B32B7/00; B32B7/04; B32B7/12; E; E04; E04D; E04D13/00; E04D13/16; B32B2266/00; B32B2266/02; B32B2266/0214; B32B2266/08; Y; Y10; Y10T; Y10T428/00; Y10T428/249921; Y10T428/249953; Y10T428/249976; Y10T442/00; Y10T442/30; Y10T442/3325; Y10T442/335; Y10T442/3366; Y10T442/60; Y10T442/647; Y10T442/651; Y10T442/652
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
116 words
A laminated insulating board comprising an insulating core of foamed phenol-formaldehyde resin which has a closed cell content of at least 85% and on least one face of said core a glass fibre woven or non-woven cloth or tissue laminated to the core with a water-based natural rubber latex adhesive, the laminate having a water absorption of not more than 10% v/v, a thermal conductivity (k-value) of less than 0.035 W/m°C., a flexural strength of at least 50×10 4 N/m 2 , a tensile strength of at least 30×10 4 N/m 2 , a compressive strength of at least 20×10 4 N/m 2 and a delamination peel strength of at least 200 N/m at room temperature.
Claim 2
Dependent Claim
116 words
A laminated insulating board comprising an insulating core of foamed phenol-formaldehyde resin which has a closed cell content of at least 85% and on least one face of said core a glass fibre woven or non-woven cloth or tissue laminated to the core with a water-based natural rubber latex adhesive, the laminate having a water absorption of not more than 10% v/v, a thermal conductivity (k-value) of less than 0.035 W/m°C., a flexural strength of at least 50×10 4 N/m 2 , a tensile strength of at least 30×10 4 N/m 2 , a compressive strength of at least 20×10 4 N/m 2 and a delamination peel strength of at least 200 N/m at room temperature.
Claim 3
Dependent Claim
24 words
A board as claimed in claim 1, wherein the core is laminated with the glass fibre tissue or cloth on two opposing major faces.
Claim 4
Dependent Claim
15 words
A board as claimed in claim 2, wherein a glass fibre non-woven tissue is used.
Claim 5
Dependent Claim
37 words
A board as claimed in claim 3, wherein the tissue has a thickness of 0.25 to 0.60 mm, a weight of 40 to 80 g/m 2 and a tensile strength of 15 to 40 N/m 2 .
Claim 6
Dependent Claim
16 words
A board as claimed in claim 1, wherein the adhesive comprises a fungicide and an anti-oxidant.
References Cited (Backward Citations)
US3968300A
Cited
US4028158A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-11-11 | 1984-05-12 | 1984-11-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-11-11 | 1988-05-12 | 1988-11-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-11-11 | 1992-05-12 | 1992-11-11 | $7700.00 | Window Closed / Lapsed |