Patent US3975140A successfully refreshed from Google Patents.
US3975140A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Space heater
Assignee: INTERNATIONAL MAGNA CORP
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Filing: 1974-08-28
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Granted: 1976-08-17
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Expires: 1994-08-28
Abstract
Abstract Space heaters employing an omnidirectional infrared radiant burner are disclosed. Cylindrical in shape, the radiant burner includes an inner cylindrical mantle comprised of three concentric fine-mesh grids which are formed from flat mesh stock. The outer of the mantle grids has a seam which is bonded to form a continuous cylinder, while the inner grids each have the shape of a split O with an open break line therein. The inner two concentric mantle grids are inserted inside the outer bonded grid, which retains them against their tendency to spring outwardly. Concentrically outward from the mantle is a larger mesh outer grid defining a radiant element, both the mantle and outer grid being retained by a pair of end caps having inner and outer annular flanges. In the lower end cap is an inlet opening for air and fuel and across the opening is a very fine mesh grid which causes turbulence and insures proper mixing of the air and fuel. The two opposed end caps are retained together by axially extending pins.
Inventors
- 👤 Eugene W. Placek
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 19:08
CPC Classifications
B; B60; B60H; B60H1/00; B60H1/22; B60H1/2203; B60H1/2212; B60H1/0025; B60K; B60K11/00; F; F23; F23D; F23D14/00; F23D14/12; F23D14/14; F23D14/145; F24; F24C; F24C3/00; F24C3/04; F24C3/042; F24C3/10; F24C3/103; B60H2001/2268; B60H2001/2293
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
197 words
An omnidirectional infrared heat generator, comprising: upper and lower end caps each having outer and inner circular flanges extending axially inwardly, said lower end cap including a central opening and means for connecting the opening to a source of fuel and air; a fuel-air mixing screen positioned across said opening in said lower end cap; a mantle comprising a plurality of concentric cylindrical wire grids retained by and extending betweeen the upper and lower inner flanges of the end caps, the outer of said concentric grids having a bonded axially extending seam, the inner grids of said plurality having circumferences of less than 360°, with axially extending gaps defined therein; an outer cylindrically wrapped grid retained by and extending between said outer flanges of said upper and lower end caps; and means for retaining said upper and lower end caps about said grids, comprising a plurality of axially extending pins extending from said upper end cap to said lower end cap between said inner and outer flanges, said pins passing through the upper and lower end caps, and means at the ends of said pins for engaging the outer surfaces of said upper and lower end caps.
Claim 2
Dependent Claim
197 words
An omnidirectional infrared heat generator, comprising: upper and lower end caps each having outer and inner circular flanges extending axially inwardly, said lower end cap including a central opening and means for connecting the opening to a source of fuel and air; a fuel-air mixing screen positioned across said opening in said lower end cap; a mantle comprising a plurality of concentric cylindrical wire grids retained by and extending betweeen the upper and lower inner flanges of the end caps, the outer of said concentric grids having a bonded axially extending seam, the inner grids of said plurality having circumferences of less than 360°, with axially extending gaps defined therein; an outer cylindrically wrapped grid retained by and extending between said outer flanges of said upper and lower end caps; and means for retaining said upper and lower end caps about said grids, comprising a plurality of axially extending pins extending from said upper end cap to said lower end cap between said inner and outer flanges, said pins passing through the upper and lower end caps, and means at the ends of said pins for engaging the outer surfaces of said upper and lower end caps.
Claim 3
Dependent Claim
175 words
An omnidirectional infrared heat generator, comprising: upper and lower end caps each having outer and inner circular flanges extending axially inwardly, said lower end cap including a central opening means for connecting the opening to a source of fuel and air; a mantle comprising a plurality of concentric cylindrical wire grids retained by and extending between the upper and lower inner flanges of the end caps, the outer of said concentric grids having a bonded axially extending seam, the inner grids of said plurality having circumferences of less than 360°, with axially extending gaps defined therein; an outer cylindrically wrapped grid retained by and extending between said outer flanges of said upper and lower end caps; and means for retaining said upper and lower end caps about said grids, comprising a plurality of axially extending pins passing through said upper end cap and extending through said lower end cap between said inner and outer flanges, and means at the ends of said pins for engaging the outer surfaces of said upper and lower end caps.
Claim 4
Dependent Claim
175 words
An omnidirectional infrared heat generator, comprising: upper and lower end caps each having outer and inner circular flanges extending axially inwardly, said lower end cap including a central opening means for connecting the opening to a source of fuel and air; a mantle comprising a plurality of concentric cylindrical wire grids retained by and extending between the upper and lower inner flanges of the end caps, the outer of said concentric grids having a bonded axially extending seam, the inner grids of said plurality having circumferences of less than 360°, with axially extending gaps defined therein; an outer cylindrically wrapped grid retained by and extending between said outer flanges of said upper and lower end caps; and means for retaining said upper and lower end caps about said grids, comprising a plurality of axially extending pins passing through said upper end cap and extending through said lower end cap between said inner and outer flanges, and means at the ends of said pins for engaging the outer surfaces of said upper and lower end caps.
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) | 1979-08-17 | 1980-02-16 | 1980-08-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-08-17 | 1984-02-16 | 1984-08-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-08-17 | 1988-02-16 | 1988-08-17 | $7700.00 | Window Closed / Lapsed |