US4564745A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pre-cast heating panel
Assignee: LES PLAQUES CHAUFFANTES PRE-USINEES COPAL (CANADA) LTEE
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Filing: 1984-02-24
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Granted: 1986-01-14
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Expires: 2004-02-24
Abstract
Abstract A heating panel includes a fiber-reinforced mortar prepared from a mixture of a cementing material, a finely divided mineral aggregate and water and incorporating a fibrous reinforcement material homogeneously dispersed therein, and a flexible electric heating element embedded in the fiber-reinforced mortar. The heating panel of the invention can be made relatively thin while still exhibiting good flexural, compressive and tensile strength properties, thus being relatively light in weight for ease of handling and low cost transportation.
Inventors
- 👤 Maurice Deschenes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 09:01
CPC Classifications
H; H05; H05B; H05B3/00; H05B3/20; H05B3/22; H05B3/28; H05B3/286; F; F24; F24D; F24D13/00; F24D13/02; F24D13/022; F24D13/024; H05B3/283; Y; Y02; Y02B; Y02B30/00
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
44 words
A heating panel comprising a fiber-reinforced mortar prepared from a mixture of a cementing material, a finely divided mineral aggregate and water and incorporating a fibrous non-electrically conductive reinforcement material homogeneously dispersed therein, and a flexible electric heating element embedded in said fiber-reinforced mortar.
Claim 2
Dependent Claim
44 words
A heating panel comprising a fiber-reinforced mortar prepared from a mixture of a cementing material, a finely divided mineral aggregate and water and incorporating a fibrous non-electrically conductive reinforcement material homogeneously dispersed therein, and a flexible electric heating element embedded in said fiber-reinforced mortar.
Claim 3
Dependent Claim
15 words
A heating panel as claimed in claim 1, wherein said cementing material comprises Portland cement.
Claim 4
Dependent Claim
16 words
A heating panel as claimed in claim 2, wherein said finely divided mineral aggregate comprises sand.
Claim 5
Dependent Claim
31 words
A heating panel as claimed in claim 3, wherein said mortar is prepared from a mixture of Portland cement, sand and water having a water to cement ratio of about 0.33-0.35.
Claim 6
Dependent Claim
16 words
A heating panel as claimed in claim 1, wherein said fibrous reinforcement material comprises asbestos fibers.
Claim 7
Dependent Claim
18 words
A heating panel as claimed in claim 1, wherein said fibrous reinforcement material comprises alkali resistant glass fibers.
Claim 8
Dependent Claim
19 words
A heating panel as claimed in claim 6, wherein said alkali resistant glass fibers are made of zirconia-containing glass.
Claim 9
Dependent Claim
33 words
A heating panel as claimed in claim 6, wherein said glass fibers are present in an amount of about 3% to about 6% by weight, based on the total weight of said mixture.
Claim 10
Dependent Claim
67 words
A heating panel as claimed in claim 4, wherein said fibrous reinforcement material comprises alkali resistant glass fibers and wherein said fiber-reinforced mortar is prepared from a mixture containing about 60% by weight of Portland cement, about 20% by weight of sand and about 20% by weight of water and incorporates about 5% by weight of said glass fibers, based on the total weight of said mixture.
Claim 11
Dependent Claim
55 words
A heating panel as claimed in claim 1, wherein said heating element consists of a cable comprising an electrical resistance wire spiraled around a flexible glass fiber core, a polyvinyl chloride sheathing surrounding said resistance wire and glass fiber core, a nylon jacket extending over said sheathing and a braided copper ground covering said jacket.
Claim 12
Dependent Claim
46 words
A heating panel as claimed in claim 10, having a rectangular configuration with opposed end edges and wherein a continuous length of said cable extends lengthwise of said panel and is bent adjacent said end edges to spread over substantially the entire area of said panel.
Claim 13
Dependent Claim
27 words
A heating panel as claimed in claim 9, having a thickness of about 5/8 of an inch and a weight per square foot of about 7 pounds.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-01-13 | 1989-07-15 | 1990-01-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-01-13 | 1993-07-15 | 1994-01-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-01-13 | 1997-07-15 | 1998-01-14 | $7700.00 | Window Closed / Lapsed |