US2955221A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cold cathode light source
Assignee: Duro Test Corp
•
Filing: 1959-04-02
•
Granted: 1960-10-04
•
Expires: 1979-04-02
Abstract
No abstract record available.
Inventors
- 👤 Thorington Luke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 05:32
CPC Classifications
H; H01; H01J; H01J63/00; H01J63/06; H01J2893/00; H01J2893/0031
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2177735A
Cited
US2222668A
Cited
US2566349A
Cited
US2783407A
Cited
US2789240A
Cited
US2802127A
Cited
US2842706A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-10-04 | 1964-04-04 | 1964-10-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-10-04 | 1968-04-04 | 1968-10-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-10-04 | 1972-04-04 | 1972-10-04 | $7700.00 | Window Closed / Lapsed |