US3260783A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vacuum oven
Assignee: Baker and Co Inc
•
Filing: 1964-10-23
•
Granted: 1966-07-12
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Expires: 1984-10-23
Abstract
No abstract record available.
Inventors
- 👤 Frank A Potenzo
- 👤 Raymond L Shearer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 08:34
CPC Classifications
C; C21; C21D; C21D1/00; C21D1/74; C21D1/773; F; F26; F26B; F26B19/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
172 words
IN A VACCUM OVEN, A FERROUS METAL MUFFLE HAVING SIDE, TOP AND BOTTOM WALLS AND HAVING END WALLS, ELECTRICAL RESITANCE HEATING MEANS ARRANGED IN INTIMATE HEAT TRANSFER RELATION OVER THE MAJORITY OF THE AREA OF THE OUTER SURFACE OF EACH OF SAID SIDE, TOP AND BOTTOM WALLS OF THE MUFFLE, AT LEAST ONE OF SAID END WALLS BEING FORMED BY A DOOR WHICH CLOSES ONE END OF THE MUFFLE AND WHICH INCLUDES A FERROUS METAL PLATE-LIKE MEMBER EXTENDING ACROSS SAID ONE END OF THE MUFFLE IN SEALED RELATION THERETO, A BLACK OXIDE COATING ON THE INNER SURFACES OF ALL OF THE AFOREMENTIONED WALLS OF THE MUFFLE, SAID BLACK OXIDE COATING BEING EVENLY DISTRIBUTED OVER THE ENTIRE AREA OF THE MUFFLE WALLS AND MATERIALLY IMPROVING THE THERMAL EMISSIVITY OF SAID TOP, BOTTOM AND SIDE WALLS AND MATERIALLY IMPROVING THE UNIFORMITY OF HEAT DISTRIBUTION BOTH VERTICALLY AND HORIZONTALLY THROUGH THE INTERIOR OF THE MUFFLE WHEN THE OVER IS OPERATED AT A VACCUM, AND MEANS FOR DRAWING A VACCUM ON THE INTERIOR OF THE MUFFLE.
Claim 2
Dependent Claim
172 words
IN A VACCUM OVEN, A FERROUS METAL MUFFLE HAVING SIDE, TOP AND BOTTOM WALLS AND HAVING END WALLS, ELECTRICAL RESITANCE HEATING MEANS ARRANGED IN INTIMATE HEAT TRANSFER RELATION OVER THE MAJORITY OF THE AREA OF THE OUTER SURFACE OF EACH OF SAID SIDE, TOP AND BOTTOM WALLS OF THE MUFFLE, AT LEAST ONE OF SAID END WALLS BEING FORMED BY A DOOR WHICH CLOSES ONE END OF THE MUFFLE AND WHICH INCLUDES A FERROUS METAL PLATE-LIKE MEMBER EXTENDING ACROSS SAID ONE END OF THE MUFFLE IN SEALED RELATION THERETO, A BLACK OXIDE COATING ON THE INNER SURFACES OF ALL OF THE AFOREMENTIONED WALLS OF THE MUFFLE, SAID BLACK OXIDE COATING BEING EVENLY DISTRIBUTED OVER THE ENTIRE AREA OF THE MUFFLE WALLS AND MATERIALLY IMPROVING THE THERMAL EMISSIVITY OF SAID TOP, BOTTOM AND SIDE WALLS AND MATERIALLY IMPROVING THE UNIFORMITY OF HEAT DISTRIBUTION BOTH VERTICALLY AND HORIZONTALLY THROUGH THE INTERIOR OF THE MUFFLE WHEN THE OVER IS OPERATED AT A VACCUM, AND MEANS FOR DRAWING A VACCUM ON THE INTERIOR OF THE MUFFLE.
References Cited (Backward Citations)
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US2035757A
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US2085450A
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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) | 1969-07-11 | 1970-01-10 | 1970-07-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-07-11 | 1974-01-10 | 1974-07-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-07-11 | 1978-01-10 | 1978-07-12 | $7700.00 | Window Closed / Lapsed |