Patent US3904355A successfully refreshed from Google Patents.
US3904355A
Expired / Lapsed
US
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Atmosphere isolating means in a continuous-type furnace
Assignee: Individual
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Filing: 1974-07-17
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Granted: 1975-09-09
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Expires: 1994-07-17
Abstract
Abstract Means for adjusting and maintaining the gas atmosphere in each zone of a continuous-type furnace. The means comprises a plurality of curtain-like units suspended one after the other and freely over the articles being conveyed on a conveyor belt for heat-treatment. A proper sealing effect between the adjoining zones of the furnace is obtained so that the heat-treatment may be conducted under optimum atmospheric and thermal operating conditions.
Inventors
- 👤 Susumu Takahashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 02:14
CPC Classifications
F; F27; F27B; F27B9/00; F27B9/04; F27B9/045; F27B9/047; C; C21; C21D; C21D1/00; C21D1/74; C23; C23C; C23C8/00; C23C8/06
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
126 words
In combination with a continuous-type furnace in which articles to be treated are transferred by conveyor means through a plurality of treating zones, means for controlling and maintaining gas atmospheres for such zones comprising a plurality of curtains arranged one closely after the other, each said curtain comprising a plurality of sets of metal segments, which are all of the same height, the segments of each set being arranged in alignment laterally but being staggered relative to those of the next adjacent set, said curtains constituting isolating means between the adjacent zones, and being freely suspended above the conveyor means for isolating the atmospheres supplied to ssiad zones from one another and for allowing the articles to freely pass through the zones via said isolating means.
Claim 2
Dependent Claim
126 words
In combination with a continuous-type furnace in which articles to be treated are transferred by conveyor means through a plurality of treating zones, means for controlling and maintaining gas atmospheres for such zones comprising a plurality of curtains arranged one closely after the other, each said curtain comprising a plurality of sets of metal segments, which are all of the same height, the segments of each set being arranged in alignment laterally but being staggered relative to those of the next adjacent set, said curtains constituting isolating means between the adjacent zones, and being freely suspended above the conveyor means for isolating the atmospheres supplied to ssiad zones from one another and for allowing the articles to freely pass through the zones via said isolating means.
Claim 3
Dependent Claim
17 words
Isolating means as claimed in claim 1, in which the segments are thermally resistive thin metallic strips.
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) | 1978-09-08 | 1979-03-10 | 1979-09-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-08 | 1983-03-10 | 1983-09-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-08 | 1987-03-10 | 1987-09-09 | $7700.00 | Window Closed / Lapsed |