Plasma producing apparatus
Abstract
Abstract 1,061,956. Induction heated plasma torch. BRITISH TITAN PRODUCTS CO. Ltd. Sept. 24, 1965 [Nov. 20, 1964], No. 47328/64. Heading H5H. Hot gaseous plasma is produced by induction heating an argon stream passing through a Cu or stainless steel tube (1), Fig. 1 (not shown), containing longitudinal inserts (2) of boron nitride and which is surrounded by a gas or water-cooled coil of Cu tube (3) connected to a high-frequency source. Argon is introduced through an inlet (5) in a PTFE head (4) with further argon introduced through tangential inlets (6) to stabilize the plasma, generation of which is initiated by inserting a metal rod into the tube (1). Excessive heating of tube (1) is prevented by the inserts and a low wall thickness which reduce eddy current heating. The tube (1) may be cooled by air streams (7) or it may be enclosed in a second similar tube and water or gaseous coolant passed between the tubes.
Inventors
- 👤 Denis Cleaver
Bibliographic Details
Claims Analysis
Total Claims: 0References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-02-18 | 1972-08-19 | 1973-02-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-02-18 | 1976-08-19 | 1977-02-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-02-18 | 1980-08-19 | 1981-02-18 | $7700.00 | Window Closed / Lapsed |