US2842706A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cold cathode vacuum tube
Assignee: Individual
•
Filing: 1956-03-01
•
Granted: 1958-07-08
•
Expires: 1976-03-01
Abstract
No abstract record available.
Inventors
- 👤 Dobischek Dietrich
- 👤 Jacobs Harold
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:10
CPC Classifications
H; H01; H01J; H01J1/00; H01J1/02; H01J1/34; H01J1/30
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
35 words
A COLD CATHODE COMPRISING A METAL BASE AND A COATING THEREON, SAID COATING COMPRISING MAGNESIUM OXIDE AND CESIUM, THE AMOUNT OF SAID MAGNESIUM OXIDE BEING AT LEAST 100 TIMES GREATER THAN THE AMOUNT OF CESIUM.
Claim 2
Dependent Claim
35 words
A COLD CATHODE COMPRISING A METAL BASE AND A COATING THEREON, SAID COATING COMPRISING MAGNESIUM OXIDE AND CESIUM, THE AMOUNT OF SAID MAGNESIUM OXIDE BEING AT LEAST 100 TIMES GREATER THAN THE AMOUNT OF CESIUM.
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) | 1961-07-07 | 1962-01-06 | 1962-07-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-07-07 | 1966-01-06 | 1966-07-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-07-07 | 1970-01-06 | 1970-07-08 | $7700.00 | Window Closed / Lapsed |