US3242374A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cold cathode with nickel base, calcium oxide interface and magnesium oxide layer
Assignee: Tung Sol Electric Inc
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Filing: 1961-04-21
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Granted: 1966-03-22
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Expires: 1981-04-21
Abstract
No abstract record available.
Inventors
- 👤 Bernard G Firth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 00:30
CPC Classifications
H; H01; H01J; H01J17/00; H01J17/02; H01J17/04; H01J17/06; H01J17/066; H01J2893/00; H01J2893/0064; H01J2893/0065; H01J2893/0066; Y; Y10; Y10T; Y10T428/00; Y10T428/249921; Y10T428/249953; Y10T428/249967; Y10T428/24997; Y10T428/29; Y10T428/2913; Y10T428/2933; Y10T428/294; Y10T428/2942; Y10T428/2949
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2840751A
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US2802127A
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US2960659A
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US2950993A
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US2925511A
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US3156844A
Cited
US3041210A
Cited
US3007075A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-03-21 | 1969-09-20 | 1970-03-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-03-21 | 1973-09-20 | 1974-03-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-03-21 | 1977-09-20 | 1978-03-22 | $7700.00 | Window Closed / Lapsed |