US3846574A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of heating objects and device for the performance of the method
Assignee: Individual
•
Filing: 1973-07-09
•
Granted: 1974-11-05
•
Expires: 1993-07-09
Abstract
Abstract A heating furnace, at least the outer surface of which is metallic, is placed in a metallic chamber, spaced and electrically insulated therefrom. An electrical glow discharge is produced in the space between the furnace and the chamber, with the metallic surface of the furnace serving as the cathode. The furnace is thus held at a high temperature for heating objects therein.
Inventors
- 👤 H Rordorf
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 23:09
CPC Classifications
H; H05; H05B; H05B7/00; H05B7/16
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
147 words
An apparatus for heating objects within a furnace comprising: a metallic furnace arranged within and electrically insUlated from a metallic chamber provided with a gas pipe leading into said chamber and connected to a pump and a gas supply pipe for maintaining a gas atmosphere of a predetermined pressure in the interior of said chamber; a current source connected, as one terminal, to said chamber and, as its other terminal, to a current lead-in insulated from the metallic walls of said chamber and contacting said furnace for maintaining an electric glow discharge between said chamber and furnace with the inner wall of said chamber and the outer side of said furnace as electrodes; and at least one separate gas supply pipe communicating with the interior of the said furnace and sealed against the interior of the said chamber for maintaining a desired gas atmosphere within said furnace.
Claim 2
Independent Claim
147 words
An apparatus for heating objects within a furnace comprising: a metallic furnace arranged within and electrically insUlated from a metallic chamber provided with a gas pipe leading into said chamber and connected to a pump and a gas supply pipe for maintaining a gas atmosphere of a predetermined pressure in the interior of said chamber; a current source connected, as one terminal, to said chamber and, as its other terminal, to a current lead-in insulated from the metallic walls of said chamber and contacting said furnace for maintaining an electric glow discharge between said chamber and furnace with the inner wall of said chamber and the outer side of said furnace as electrodes; and at least one separate gas supply pipe communicating with the interior of the said furnace and sealed against the interior of the said chamber for maintaining a desired gas atmosphere within said furnace.
Claim 3
Dependent Claim
33 words
A device according to claim 1, characterized by the fact that the said gas supply pipe for the said furnace is formed of metal and constitutes said current lead-in to the said furnace.
Claim 4
Dependent Claim
48 words
Apparatus according to claim 1 characterized by a double-walled chamber of which the inside wall is attached to the outer wall by means of thermally insulating props while the inside surfaces of the inside and outside walls facing one another are provided with surfaces that reflect thermal radiation.
Claim 5
Dependent Claim
20 words
Apparatus according to claim 3 characterized by the fact that a polished foil is provided on the said inside surfaces.
Claim 6
Dependent Claim
27 words
Apparatus according to claim 1 characterized in that a conduit is provided from the space between the two walls of the said chamber and the said pump.
Claim 7
Dependent Claim
26 words
Apparatus according to claim 1 characterized by a passageway from the space between the two walls of the said chamber and the interior of said furnace.
Claim 8
Dependent Claim
39 words
Apparatus according to claim 1 characterized by supporting insulators with a protective gap system for all joints subjected to the glow discharge between metal and insulating material between the said furnace and the inside wall of the said chamber.
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) | 1977-11-04 | 1978-05-06 | 1978-11-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-11-04 | 1982-05-06 | 1982-11-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-11-04 | 1986-05-06 | 1986-11-05 | $7700.00 | Window Closed / Lapsed |