US2575516A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Glow tube switch
Assignee: Northrop Grumman Corp
•
Filing: 1949-06-20
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Granted: 1951-11-20
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Expires: 1969-06-20
Abstract
No abstract record available.
Inventors
- 👤 Glenn E Hagen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 02:00
CPC Classifications
H; H03; H03K; H03K3/00; H03K3/02; H03K3/37; H03K17/00; H03K17/51; H03K17/52
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) | 1954-11-19 | 1955-05-21 | 1955-11-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-11-19 | 1959-05-21 | 1959-11-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-11-19 | 1963-05-21 | 1963-11-20 | $7700.00 | Window Closed / Lapsed |