US3845344A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ignition apparatus for a plasma burner
Assignee: Gebrueder Boehler and Co AG
•
Filing: 1973-09-10
•
Granted: 1974-10-29
•
Expires: 1993-09-10
Abstract
Abstract A safe, convenient ignition arrangement is described for a ''''cold'''' plasma burner adapted, e.g., to effect a finishing surface-hardening operation on a grounded metallic workpiece. Argon or other plasma-forming gas is subjected to an electromagnetic field in an elongated ionization chamber. The resulting ionized gas passes through a working gap formed between an output nozzle of the conductive chamber and an elongated electrode mounted axially in the chamber. A remotely located switch is operative to complete an electrical path to ground through the gap and the electrode, thereby igniting the ionized gas.
Inventors
- 👤 R Rainer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 09:33
CPC Classifications
H; H05; H05H; H05H1/00; H05H1/24; H05H1/26; H05H1/30; H05H1/32; H05H1/34; H05H1/36
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
120 words
In a plasma burner apparatus including an elongated, electrically conductive chamber for ionizing a plasma- forming gas by subjecting the gas to an electromagnetic field and for igniting the ionized gas by completing an electrical path to ground through the ionized gas via an output nozzle at the lower end of the chamber, an improved arrangement for igniting the ionized gas, which comprises: an elongated elecTrode extending longitudinally downward through the chamber in spaced relation with the chamber walls, the lower end of the electrode terminating within the chamber adjacent the output nozzle to form a working gap; and switching means associated with the chamber and operable to ground the electrode to complete the electrical path through the working gap.
Claim 2
Dependent Claim
120 words
In a plasma burner apparatus including an elongated, electrically conductive chamber for ionizing a plasma- forming gas by subjecting the gas to an electromagnetic field and for igniting the ionized gas by completing an electrical path to ground through the ionized gas via an output nozzle at the lower end of the chamber, an improved arrangement for igniting the ionized gas, which comprises: an elongated elecTrode extending longitudinally downward through the chamber in spaced relation with the chamber walls, the lower end of the electrode terminating within the chamber adjacent the output nozzle to form a working gap; and switching means associated with the chamber and operable to ground the electrode to complete the electrical path through the working gap.
Claim 3
Dependent Claim
50 words
An arrangement as defined in claim 1, in which the burner apparatus includes an insulating sleeve extending longitudinally downward through the chamber and having a central bore, the electrode being disposed in the central bore with the lower end of the electrode extending beyond the lower end of the bore.
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) | 1977-10-28 | 1978-04-29 | 1978-10-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-10-28 | 1982-04-29 | 1982-10-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-10-28 | 1986-04-29 | 1986-10-29 | $7700.00 | Window Closed / Lapsed |