Patent US4294436A successfully refreshed from Google Patents.
US4294436A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Furnace with protective atmosphere for heating metals
Assignee: Kanto Yakin Kogyo Co Ltd
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Filing: 1980-08-29
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Granted: 1981-10-13
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Expires: 2000-08-29
Abstract
Abstract A furnace for the heat-treatment of metallic articles with a protective atmosphere such as a reductive gas mainly consisting of H 2 , CO, N 2 . Said protective atmospheric gas is made from LPG, LNG, urban gas and other raw natural gases which have been supplied into the furnace directly from their sources by heating them by heating elements within the furnace and simultaneously converting them by a plurality of catalytic means extending along said heating elements.
Inventors
- 👤 Susumu Takahashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 20:58
CPC Classifications
C; C23; C23C; C23C8/00; C23C8/06; C23C8/08; C23C8/20; C23C8/22; C21; C21D; C21D1/00; C21D1/74; C21D1/76; C21D1/763
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
130 words
A furnace having a protective atmosphere therein for heat-treating metallic articles, comprising a heating enclosure having between the sidewalls thereof a space for accommodating said articles to be treated within the furnace, piping means having its discharge communicating with said space for supplying into said enclosure a raw material gas for forming said protective atmosphere, heating elements provided in the said enclosure, and catalytic means extending into the enclosure adjacent to said heating means and and operative to react with said raw material gas to convert it into said protective atmosphere, said catalytic means comprising a plurality of spaced, metallic, catalytic elements secured in said enclosure adjacent opposite sides thereof, and with at least certain of said catalyst elements being disposed in spaced relation to said sidewalls of said enclosure.
Claim 2
Dependent Claim
130 words
A furnace having a protective atmosphere therein for heat-treating metallic articles, comprising a heating enclosure having between the sidewalls thereof a space for accommodating said articles to be treated within the furnace, piping means having its discharge communicating with said space for supplying into said enclosure a raw material gas for forming said protective atmosphere, heating elements provided in the said enclosure, and catalytic means extending into the enclosure adjacent to said heating means and and operative to react with said raw material gas to convert it into said protective atmosphere, said catalytic means comprising a plurality of spaced, metallic, catalytic elements secured in said enclosure adjacent opposite sides thereof, and with at least certain of said catalyst elements being disposed in spaced relation to said sidewalls of said enclosure.
Claim 3
Dependent Claim
22 words
A furnace as defined in claim 1, including an agitator mounted in said enclosure and operative positively to circulate the gas therein.
Claim 4
Dependent Claim
26 words
A furnace as defined in claim 1, wherein said catalytic elements are positioned adjacent opposite sides respectively, of said heating elements, and in spaced relation thereto.
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) | 1984-10-12 | 1985-04-13 | 1985-10-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-10-12 | 1989-04-13 | 1989-10-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-10-12 | 1993-04-13 | 1993-10-13 | $7700.00 | Window Closed / Lapsed |