US2203452A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electronic discharge tube
Assignee: Individual
•
Filing: 1938-12-17
•
Granted: 1940-06-04
•
Expires: 1958-12-17
Abstract
No abstract record available.
Inventors
- 👤 Berghaus Bernhard
- 👤 Burkhardt Wilhelm
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 14:39
CPC Classifications
H; H01; H01J; H01J37/00; H01J37/32; H01J37/32009; H01J37/32018; H01J3/00; H01J3/02; H01J3/025; H01J2893/00; H01J2893/0061
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1943-06-04 | 1943-12-04 | 1944-06-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1947-06-04 | 1947-12-04 | 1948-06-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1951-06-04 | 1951-12-04 | 1952-06-04 | $7700.00 | Window Closed / Lapsed |