US2491234A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cold cathode discharge tube
Assignee: Hartford National Bank and Trust Co
•
Filing: 1947-02-12
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Granted: 1949-12-13
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Expires: 1967-02-12
Abstract
No abstract record available.
Inventors
- 👤 Veenemans Cornelis Frederik
- 👤 Pieter Geert Van Zanten
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 15:47
CPC Classifications
H; H01; H01J; H01J19/00; H01J19/82; B; B82; B82Y; B82Y10/00; H01J1/00; H01J1/02; H01J1/30; H01J1/312
Claims Analysis
Total Claims: 0
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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) | 1952-12-12 | 1953-06-13 | 1953-12-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-12-12 | 1957-06-13 | 1957-12-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-12-12 | 1961-06-13 | 1961-12-13 | $7700.00 | Window Closed / Lapsed |