US2729762A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cold cathode switch tube
Assignee: Northrop Grumman Corp
•
Filing: 1950-04-18
•
Granted: 1956-01-03
•
Expires: 1970-04-18
Abstract
No abstract record available.
Inventors
- 👤 Glenn E Hagen
- 👤 Charles R Williams
- 👤 Robert D Hancock
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 10:16
CPC Classifications
H; H03; H03K; H03K23/00; H03K23/82; H03K3/00; H03K3/02; H03K3/37
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1316967A
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US1481422A
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US1822865A
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US1949617A
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US1950003A
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US2116677A
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US2449697A
Cited
US2575516A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-01-02 | 1959-07-04 | 1960-01-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-01-02 | 1963-07-04 | 1964-01-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-01-02 | 1967-07-04 | 1968-01-03 | $7700.00 | Window Closed / Lapsed |