Patent US1625485A successfully refreshed from Google Patents.
US3138734A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Prevention of cathode poisoning in an electron tube
Assignee: Corning Glass Works
•
Filing: 1960-07-01
•
Granted: 1964-06-23
•
Expires: 1980-07-01
Abstract
No abstract record available.
Inventors
- 👤 Jack L Lineweaver
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 10:12
CPC Classifications
H; H01; H01J; H01J7/00; H01J7/14; H01J7/18; H01J29/00; H01J29/94
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
75 words
IN AN ELECTRON TUBE COMPRISING AN OXYGEN-SENSITIVE CATHODE AND A GLASS COMPONENT HAVING AN ELECTRICALLY CONDUCTING COATING, AND WHEREIN AT LEAST A PORTION OF THE GLASS COMPONENT IS SUBJECTED TO BOMBARDMENT BY ELECTRONS UNDER INFLUENCE OF A HIGH VOLTAGE GRADIENT, THE IMPROVEMENT WHICH COMPRISES AN ELECTRICALLY CONDUCING METAL OXIDE FILM ADHERENT TO AND COVERING AT LEAST THAT PORTION OF THE GLASS SURFACE SUBJECTED TO ELECTRON BOMBARDMENT, WHEREBY OXYGEN EVOLUTION DUE TO SUCH BOMBARDMENT IS INHIBITED.
Claim 2
Dependent Claim
75 words
IN AN ELECTRON TUBE COMPRISING AN OXYGEN-SENSITIVE CATHODE AND A GLASS COMPONENT HAVING AN ELECTRICALLY CONDUCTING COATING, AND WHEREIN AT LEAST A PORTION OF THE GLASS COMPONENT IS SUBJECTED TO BOMBARDMENT BY ELECTRONS UNDER INFLUENCE OF A HIGH VOLTAGE GRADIENT, THE IMPROVEMENT WHICH COMPRISES AN ELECTRICALLY CONDUCING METAL OXIDE FILM ADHERENT TO AND COVERING AT LEAST THAT PORTION OF THE GLASS SURFACE SUBJECTED TO ELECTRON BOMBARDMENT, WHEREBY OXYGEN EVOLUTION DUE TO SUCH BOMBARDMENT IS INHIBITED.
References Cited (Backward Citations)
US2027277A
Cited
US2556254A
Cited
US2564707A
Cited
US2730643A
Cited
US2825833A
Cited
US2858466A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-06-23 | 1967-12-23 | 1968-06-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-06-23 | 1971-12-23 | 1972-06-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-06-23 | 1975-12-23 | 1976-06-23 | $7700.00 | Window Closed / Lapsed |