Patent US5018707A successfully refreshed from Google Patents.
US5018707A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heating furnace
Assignee: Allstate Financial Corp
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Filing: 1989-03-14
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Granted: 1991-05-28
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Expires: 2009-03-14
Abstract
Abstract A heating mantle for heating materials, such as metals, alloys or inorganic chemicals in a retort, includes a tubular wall and annular chambers cooperating with said wall for forming a tortious path around the retort for hot gases. The mantle provides a very high convective heat transfer coefficient.
Inventors
- 👤 Klaus H. Hemsath
- 👤 H. Kenneth Staffin
- 👤 Michael Owsiany
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 21:50
CPC Classifications
C; C21; C21D; C21D9/00; C21D9/0043; F; F27; F27B; F27B17/00; F27B5/00; F27B5/06; F27B5/14; F27D; F27D7/00; F27D7/04
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
124 words
A heating mantle for heating a retort having an elongated tubular body comprising: a source of hot gases; cylindrical wall means; and a plurality of baffles supported by and extending radially inwardly from said cylindrical wall means to form a space for said retort, said baffles and said cylindrical wall means cooperating to form a plurality of heating chambers in communication with said source and open to said space, said chambers defining a tortuous path for said gases for transferring heat to said retort; said cylindrical wall means being disposed substantially vertically, and said baffles extending in planes perpendicular to said cylindrical wall means, said heating chambers being interconnected by slots in said baffles, said slots being radially offset from one baffle to another.
Claim 2
Dependent Claim
124 words
A heating mantle for heating a retort having an elongated tubular body comprising: a source of hot gases; cylindrical wall means; and a plurality of baffles supported by and extending radially inwardly from said cylindrical wall means to form a space for said retort, said baffles and said cylindrical wall means cooperating to form a plurality of heating chambers in communication with said source and open to said space, said chambers defining a tortuous path for said gases for transferring heat to said retort; said cylindrical wall means being disposed substantially vertically, and said baffles extending in planes perpendicular to said cylindrical wall means, said heating chambers being interconnected by slots in said baffles, said slots being radially offset from one baffle to another.
Claim 3
Dependent Claim
28 words
The heating mantle of claim 1 further comprising an input chamber connected to said heating chambers, and a burner for firing said hot gases into said input chamber.
Claim 4
Dependent Claim
113 words
A heating apparatus comprising: a housing made of an insulating material and having a top; a cylindrical wall imbedded in said insulating material and having a longitudinal axis; a plurality of ceramic baffles supported from said cylindrical wall and extending radially inward to form a tubular space, said baffles cooperating to define annular heating chambers open to said space; a retort for holding materials for heating said retort being supported by said top and extending into said tubular space without touching said baffles; and a source of hot gases; said baffles, said cylindrical wall and said retort cooperating to form a tortuous path for hot gases for convective heat transfer to said retort.
Claim 5
Dependent Claim
113 words
A heating apparatus comprising: a housing made of an insulating material and having a top; a cylindrical wall imbedded in said insulating material and having a longitudinal axis; a plurality of ceramic baffles supported from said cylindrical wall and extending radially inward to form a tubular space, said baffles cooperating to define annular heating chambers open to said space; a retort for holding materials for heating said retort being supported by said top and extending into said tubular space without touching said baffles; and a source of hot gases; said baffles, said cylindrical wall and said retort cooperating to form a tortuous path for hot gases for convective heat transfer to said retort.
Claim 6
Dependent Claim
22 words
The heating apparatus of claim 3 wherein each baffle is formed with a radial slot for providing communication between adjacent heating chambers.
Claim 7
Dependent Claim
22 words
The heating apparatus of claim 4 wherein the slot of one baffle is angularly offset from the slot of an adjacent baffle.
Claim 8
Dependent Claim
28 words
The heating apparatus of claim 3 further comprising an input chamber connected to said heating chambers and a burner for firing said hot gases into said input chamber.
Claim 9
Dependent Claim
14 words
The heating apparatus of claim 3 further comprising a pedestal for protecting said retort.
Claim 10
Dependent Claim
21 words
The heating apparatus of claim 7 wherein said retort includes an output pipe for adding and removing material from said retort.
Claim 11
Dependent Claim
17 words
The heating apparatus of claim 8 wherein said output pipe extends at least partially through said pedestal.
Claim 12
Dependent Claim
20 words
The heating apparatus of claim 3 wherein said retort includes an input opening for removing and receiving materials for heating.
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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) | 1994-05-27 | 1994-11-26 | 1995-05-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-05-27 | 1998-11-26 | 1999-05-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-05-27 | 2002-11-26 | 2003-05-28 | $7700.00 | Window Closed / Lapsed |