Patent US4593182A successfully refreshed from Google Patents.
US4593182A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electric cartridge heater
Assignee: Hotset Heizpatronen und Zubehoer GmbH
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Filing: 1984-11-16
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Granted: 1986-06-03
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Expires: 2004-11-16
Abstract
Abstract A cartridge heater includes an inner casing in which a heating element is accommodated. This inner casing is surrounded by an coaxially arranged outer casing of larger diameter so that an annular space is defined between the inner and outer casings. In the space a helical coolant piping is arranged, embedded in a highly heat-conductive substance of granular and/or pulverulent form so as to allow excess heat to be carried away.
Inventors
- 👤 Eugen Schwarzkopf
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 16:36
CPC Classifications
H; H05; H05B; H05B3/00; H05B3/40; H05B3/42; H05B3/48; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49082; Y10T29/49087; Y10T29/49089; Y10T29/49091
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
115 words
An electric cartridge heater comprising: an inner casing of heat conductive material having a longitudinal axis; an elastic heating coil within said inner casing extending along said axis; a compacted body of granular heat conductive but electrically insulating material surrounding said coil and filling said inner casing; an outer casing of heat conductive material surrounding said inner casing and defining an annular space therewith; a cooling-tube coil in said space surrounding said inner casing for carrying away excess heat and in contact with at least one of said casings and in thermally conductive relationship with both casings; and a compacted mass of thermally conductive granules filling said space between the turns of said cooling-tube coil.
Claim 2
Dependent Claim
115 words
An electric cartridge heater comprising: an inner casing of heat conductive material having a longitudinal axis; an elastic heating coil within said inner casing extending along said axis; a compacted body of granular heat conductive but electrically insulating material surrounding said coil and filling said inner casing; an outer casing of heat conductive material surrounding said inner casing and defining an annular space therewith; a cooling-tube coil in said space surrounding said inner casing for carrying away excess heat and in contact with at least one of said casings and in thermally conductive relationship with both casings; and a compacted mass of thermally conductive granules filling said space between the turns of said cooling-tube coil.
Claim 3
Dependent Claim
17 words
A cartridge heater as defined in claim 2 wherein said conductive granules are at least predominantly copper.
Claim 4
Dependent Claim
21 words
A cartridge heater as defined in claim 2 wherein said cooling tube coil has surfaces in contact with both said casings.
Claim 5
Dependent Claim
17 words
A cartridge heater as defined in claim 3 wherein said cooling tube coil has a polygonal cross-section.
Claim 6
Dependent Claim
38 words
A cartridge heater as defined in claim 4 wherein said cooling-tube coil has a rectangular cross-section so as to define two opposing sides of longer dimensions which extend in direction of said axis, said sides constituting said surfaces.
Claim 7
Dependent Claim
18 words
A cartridge heater as defined in claim 1 wherein said outer casing is of a highly heat-conductive metal.
Claim 8
Dependent Claim
15 words
A cartridge heater as defined in claim 6 wherein said outer casing is of copper.
Claim 9
Dependent Claim
37 words
A cartridge heater as defined in claim 2, further comprising at least two rings, said space having opposing end faces, each of which being sealed off in a tight manner by a respective one of said rings.
Claim 10
Dependent Claim
16 words
A cartridge heater as defined in claim 8 wherein each of said rings is of copper.
Claim 11
Dependent Claim
19 words
A cartridge heater as defined in claim 2 wherein said cooling-tube coil is sectioned in zones of different pitches.
Claim 12
Dependent Claim
24 words
A cartridge heater as defined in claim 2 wherein said cooling-tube coil extends parallel to said axis along a portion of said heating coil.
Claim 13
Dependent Claim
41 words
A cartridge heater as defined in claim 2 wherein said cooling-tube coil is arranged around said inner casing in a shape of a double helix and has two end connections extending through said outer casing to project radially toward the outside.
Claim 14
Dependent Claim
43 words
A cartridge heater as defined in claim 2 wherein said cooling-tube coil is arranged around said inner casing in the shape of a double helix and has two end connections extending axis parallel through one of said rings to project toward the outside.
References Cited (Backward Citations)
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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) | 1989-06-02 | 1989-12-02 | 1990-06-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-06-02 | 1993-12-02 | 1994-06-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-06-02 | 1997-12-02 | 1998-06-03 | $7700.00 | Window Closed / Lapsed |