US3374385A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electron tube cathode with nickel-tungsten alloy base and thin nickel coating
Assignee: RCA Corp
•
Filing: 1963-07-10
•
Granted: 1968-03-19
•
Expires: 1983-07-10
Abstract
No abstract record available.
Inventors
- 👤 Charles T Lattimer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 23:12
CPC Classifications
H; H01; H01J; H01J1/00; H01J1/02; H01J1/13; H01J1/14; H01J1/20; H01J1/26; Y; Y10; Y10S; Y10S428/00; Y10S428/922; Y10S428/923; Y10S428/924; Y10S428/925; Y10T; Y10T428/00; Y10T428/12; Y10T428/12493; Y10T428/12535; Y10T428/12611; Y10T428/12771; Y10T428/12861; Y10T428/12944
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
76 words
AN INDIRECTLY HEATED CATHODE FOR AN ELELCTRON TUBE COMPRISING: (A) A BASE ELEMENT WHICH EXHIBITS DESIRABLE ELECTRON EMISSIVE PROPERTIES SUPERIOR TO THOSE OF A NICKEL BASE ELEMENT AND TO WHICH ELECTRON EMISSIVE MATERIALS DO NOT SATISFACTORILY ADHERE, CONSISTING OF NICKEL-TUNGSTEN ALLOY, (B) A COATING OF NICKEL HAVING A THICKNESS NOT GREATER THAN 0.0006 INCH ON A PORTION OF THE SURFACE OF SAID BASE ELEMENT, AND (C) A LAYER OF ELECTRON EMISSIVE MATERIAL ON SAID NICKEL COATING.
Claim 2
Dependent Claim
76 words
AN INDIRECTLY HEATED CATHODE FOR AN ELELCTRON TUBE COMPRISING: (A) A BASE ELEMENT WHICH EXHIBITS DESIRABLE ELECTRON EMISSIVE PROPERTIES SUPERIOR TO THOSE OF A NICKEL BASE ELEMENT AND TO WHICH ELECTRON EMISSIVE MATERIALS DO NOT SATISFACTORILY ADHERE, CONSISTING OF NICKEL-TUNGSTEN ALLOY, (B) A COATING OF NICKEL HAVING A THICKNESS NOT GREATER THAN 0.0006 INCH ON A PORTION OF THE SURFACE OF SAID BASE ELEMENT, AND (C) A LAYER OF ELECTRON EMISSIVE MATERIAL ON SAID NICKEL COATING.
References Cited (Backward Citations)
US2143853A
Cited
GB545926A
Cited
GB749256A
Cited
US2912611A
Cited
US2773212A
Cited
US3055087A
Cited
US2848410A
Cited
GB797095A
Cited
US2993264A
Cited
GB866194A
Cited
US3005926A
Cited
US3147547A
Cited
US3170772A
Cited
GB926845A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-03-19 | 1971-09-18 | 1972-03-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-03-19 | 1975-09-18 | 1976-03-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-03-19 | 1979-09-18 | 1980-03-19 | $7700.00 | Window Closed / Lapsed |