Patent US2021568A successfully refreshed from Google Patents.
Patent US2860268A successfully refreshed from Google Patents.
US2860268A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Structures for grid control gas tubes
Assignee: Electrons Inc
•
Filing: 1954-03-09
•
Granted: 1958-11-11
•
Expires: 1974-03-09
Abstract
No abstract record available.
Inventors
- 👤 Donald V Edwards
- 👤 Earle K Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 20:31
CPC Classifications
H; H01; H01J; H01J17/00; H01J17/50; H01J17/52; H01J17/54; H01J17/56
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US2111506A
Cited
US2100196A
Cited
US2229734A
Cited
US2456540A
Cited
US2459277A
Cited
US2508529A
Cited
US2650997A
Cited
US2747120A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-11-10 | 1962-05-12 | 1962-11-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-11-10 | 1966-05-12 | 1966-11-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-11-10 | 1970-05-12 | 1970-11-11 | $7700.00 | Window Closed / Lapsed |