US4082938A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thermionic heater cathode assembly of electron-beam gun
Assignee: Individual
•
Filing: 1977-05-10
•
Granted: 1978-04-04
•
Expires: 1997-05-10
Abstract
Abstract A thermionic heater cathode assembly for an electron-beam gun, comprising a disc cathode made of a highly-emissive material and disposed near a metal ribbon filament the thermionic portion whereof has a W shape, the distance between two apices of said thermionic portion being 0.6 to 0.8 of the disc cathode diameter and the depth of the valley between the apices constituting 0.5 to 0.6 of said diameter.
Inventors
- 👤 Igor Vladimirovich Shergov
- 👤 Vladimir Danilovich Slavinsky
- 👤 Lev Moiseevich Fridlender
- 👤 Valery Ivanovich Zharinov
- 👤 Arkady Filippovich Kozhaev
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 03:28
CPC Classifications
H; H01; H01J; H01J37/00; H01J37/02; H01J37/04; H01J37/06; H01J37/065
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
73 words
A thermionic heater cathode assembly of an electron-beam gun comprising: a disc cathode made of a highly-emissive material; a metal ribbon filament of the cathode, with a thermionic portion disposed near said disc cathode; said thermionic portion having a W shape, the distance between two apices being 0,6 to 0,8 of the diameter of said disc cathode and the depth of the valley between the apices being 0,5 to 0,6 of said diameter.
Claim 2
Dependent Claim
73 words
A thermionic heater cathode assembly of an electron-beam gun comprising: a disc cathode made of a highly-emissive material; a metal ribbon filament of the cathode, with a thermionic portion disposed near said disc cathode; said thermionic portion having a W shape, the distance between two apices being 0,6 to 0,8 of the diameter of said disc cathode and the depth of the valley between the apices being 0,5 to 0,6 of said diameter.
References Cited (Backward Citations)
US3500454A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-04-03 | 1981-10-03 | 1982-04-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-04-03 | 1985-10-03 | 1986-04-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-04-03 | 1989-10-03 | 1990-04-04 | $7700.00 | Window Closed / Lapsed |