US3480820A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Indicator tube having auxiliary electrodes for maintaining cathode glow
Assignee: Unisys Corp
•
Filing: 1967-09-08
•
Granted: 1969-11-25
•
Expires: 1987-09-08
Abstract
No abstract record available.
Inventors
- 👤 Richard B Fehnel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 09:53
CPC Classifications
H; H01; H01J; H01J17/00; H01J17/38; H01J17/48; H01J17/49; H01J2893/00; H01J2893/0069
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1955391A
Cited
US2756366A
Cited
US2917651A
Cited
US2996635A
Cited
US3005922A
Cited
US3262010A
Cited
US3242378A
Cited
US3242370A
Cited
US3358176A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-11-24 | 1973-05-26 | 1973-11-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-11-24 | 1977-05-26 | 1977-11-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-11-24 | 1981-05-26 | 1981-11-25 | $7700.00 | Window Closed / Lapsed |