US4151827A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Combined cast fireplace and heat exchanger
Assignee: Individual
•
Filing: 1977-09-12
•
Granted: 1979-05-01
•
Expires: 1997-09-12
Abstract
Abstract A cast fireplace comprising a heat exchanger as the rear wall component. The side walls, sloping top, and bottom plate are constructed of precast, refractory cement panels with the rear wall comprising a metal heat exchanger. Suitable ducting combined with a blower circulates air from the room through the heat exchanger and exhausts the heated air into the room to be heated. The efficiency of the fireplace is substantially enhanced by the combination extracting heat from the fire and projecting it into the room. The heat exchanger may be incorporated in the conventional brick fireplace; however, in the preferred embodiment precast, refractory cement slabs are utilized in the construction.
Inventors
- 👤 William J. Rae
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 13:13
CPC Classifications
F; F24; F24B; F24B1/00; F24B1/18; F24B1/185; F24B1/188; F24B1/1885
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
134 words
A combined cast fireplace and heat exchanger comprising: a. a precast bottom plate, b. a precast, first side wall projecting upward from said bottom plate, c. a precast, second side wall symmetrical with said first side wall projecting upward from said bottom plate, d. a precast, sloping top extending from said first side wall to said second side wall, e. a heat exchanger resting on and projecting upward from said bottom plate forming a composite integral structure with said first side wall, said second side wall and said sloping top, said heat exchanger constituting the rear wall of said fireplace enclosing the rear of the substantially pentagonal structure and including a power driven blower, a conduit interconnecting said blower and an inlet of said heat exchanger, and outlet means exiting from said heat exchanger.
Claim 2
Dependent Claim
134 words
A combined cast fireplace and heat exchanger comprising: a. a precast bottom plate, b. a precast, first side wall projecting upward from said bottom plate, c. a precast, second side wall symmetrical with said first side wall projecting upward from said bottom plate, d. a precast, sloping top extending from said first side wall to said second side wall, e. a heat exchanger resting on and projecting upward from said bottom plate forming a composite integral structure with said first side wall, said second side wall and said sloping top, said heat exchanger constituting the rear wall of said fireplace enclosing the rear of the substantially pentagonal structure and including a power driven blower, a conduit interconnecting said blower and an inlet of said heat exchanger, and outlet means exiting from said heat exchanger.
Claim 3
Dependent Claim
90 words
The invention of claim 1 wherein said heat exchanger comprises: a. a front wall extending the length, width and height of the rear of a fireplace, b. a rear wall of substantially identical dimensions as said front wall secured to said rear wall spaced from and parallel thereto, such spaced structure providing for, c. an air space between said front wall and said rear wall, d. said inlet comprising an opening into the said air space, and e. said outlet mean as comprising an opening leading from said air space.
Claim 4
Dependent Claim
52 words
The invention of claim 1 wherein said first side, said second side and said sloping top comprise: a. internal metal reinforcing mesh, and b. assembly wires secured to said internal metal reinforcing mesh projecting external of said side plates, said assembly wires adapted to be attached to facilitate assembly of the device.
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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) | 1982-04-30 | 1982-10-30 | 1983-05-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-04-30 | 1986-10-30 | 1987-05-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-04-30 | 1990-10-30 | 1991-05-01 | $7700.00 | Window Closed / Lapsed |