Patent US4170218A successfully refreshed from Google Patents.
US4170218A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fireplace heaters
Assignee: Individual
•
Filing: 1977-08-15
•
Granted: 1979-10-09
•
Expires: 1997-08-15
Abstract
Abstract The specification discloses fireplace heaters wherein U-shaped, heat exchanging ducts serve also as grates for logs, and each heater has two duct-like legs telescoping into the legs of the heat exchanging duct thereof. A front channel-like member is secured to the legs. In one embodiment, a box-like housing with a blower at one end portion and an outlet grille at the other end portion is secured to the channel member. In an alternate embodiment, a blower unit is attached to the channel member. Each heat exchanging duct may be inverted for either a flush-type fireplace or for a pit-type fireplace.
Inventors
- 👤 Ronald C. Hartley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:31
CPC Classifications
F; F24; F24B; F24B1/00; F24B1/18; F24B1/185; F24B1/188; F24B1/1885; F24B1/1886
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
153 words
In a fireplace heater, a U-shaped rear duct having a forwardly opening inlet and an outlet and formed into a grate to be inserted into a fireplace for supporting wood to be burned, an inlet duct telescopically fitting into the inlet, an outlet duct telescopically fitting into the outlet, blower means connected to the inlet duct, and a grill-like housing means connected to the blower means and mechanically connecting the inlet duct to the outlet duct and adapted to lay along a hearth outside a fireplace, the blower means being mounted in the housing, the rear duct being invertible, the inlet and the outlet being positioned in the upper portion of the rear duct when the latter is in one position for a pit-type fireplace and the inlet and the outlet being positioned in the lower portion of the rear duct when the latter is in an inverted position for a flush-type fireplace.
Claim 2
Dependent Claim
153 words
In a fireplace heater, a U-shaped rear duct having a forwardly opening inlet and an outlet and formed into a grate to be inserted into a fireplace for supporting wood to be burned, an inlet duct telescopically fitting into the inlet, an outlet duct telescopically fitting into the outlet, blower means connected to the inlet duct, and a grill-like housing means connected to the blower means and mechanically connecting the inlet duct to the outlet duct and adapted to lay along a hearth outside a fireplace, the blower means being mounted in the housing, the rear duct being invertible, the inlet and the outlet being positioned in the upper portion of the rear duct when the latter is in one position for a pit-type fireplace and the inlet and the outlet being positioned in the lower portion of the rear duct when the latter is in an inverted position for a flush-type fireplace.
Claim 3
Dependent Claim
17 words
The fireplace heater of claim 1 including a front bar for holding wood on the rear duct.
Claim 4
Dependent Claim
43 words
The fireplace heater of claim 2 wherein the rear duct has a pair of sockets centered between the top and bottom of the rear duct and the bar including a pair of angled legs holding the bar and detachably fitting into the sockets.
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) | 1982-10-08 | 1983-04-09 | 1983-10-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-10-08 | 1987-04-09 | 1987-10-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-10-08 | 1991-04-09 | 1991-10-09 | $7700.00 | Window Closed / Lapsed |