Patent US4257481A successfully refreshed from Google Patents.
US4257481A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cement panel heat exchangers
Assignee: Individual
•
Filing: 1976-06-03
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Granted: 1981-03-24
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Expires: 1996-06-03
Abstract
Abstract A heat exchange element for solar heating is made of a solidified material such as concrete, cement, ceramic or resin bonded particulate material. Internal ducting is provided by embedded pipes or within the material itself. In the latter case a former is removed after the material is set, and this may be a rigid member, or one that can be dissolved or melted out. The element is preferably a laminated panel-like structure, possibly with fibre reinforcement.
Inventors
- 👤 Michael J. Dobson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 23:04
CPC Classifications
F; F24; F24S; F24S70/00; F24S70/10; F24S70/16; F24S20/00; F24S20/60; F24S20/64; F24S20/66; Y; Y02; Y02B; Y02B10/00; Y02B10/20; Y02E; Y02E10/00; Y02E10/40; Y02E10/44; Y10; Y10S; Y10S165/00; Y10S165/905
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
64 words
A solar heating panel constructed principally in layers of cement mixes, upper and lower layers having glass fiber reinforcement and a middle layer being channeled to form a liquid conduit, there being an inlet and an outlet to and from said conduit, said fiber reinforcement being disposed only in said upper and lower layers and said middle layer being substantially free of fiber reinforcement
Claim 2
Dependent Claim
64 words
A solar heating panel constructed principally in layers of cement mixes, upper and lower layers having glass fiber reinforcement and a middle layer being channeled to form a liquid conduit, there being an inlet and an outlet to and from said conduit, said fiber reinforcement being disposed only in said upper and lower layers and said middle layer being substantially free of fiber reinforcement
Claim 3
Dependent Claim
16 words
A solar heating panel according to claim 1, wherein the lower layer provides an insulating backing.
Claim 4
Dependent Claim
19 words
A solar heating panel according to claim 1, wherein the exposed surface of the upper layer is dark colored.
Claim 5
Dependent Claim
20 words
A solar heating panel according to claim 1, in which said cement mixes are mixtures of mineral cement and sand.
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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) | 1984-03-23 | 1984-09-22 | 1985-03-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-03-23 | 1988-09-22 | 1989-03-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-03-23 | 1992-09-22 | 1993-03-24 | $7700.00 | Window Closed / Lapsed |