US2870430A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Distortion indicator
Assignee: Northrop Grumman Corp
•
Filing: 1952-08-09
•
Granted: 1959-01-20
•
Expires: 1972-08-09
Abstract
No abstract record available.
Inventors
- 👤 Robert D Hancock
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:32
CPC Classifications
G; G11; G11B; G11B27/00; G11B27/36; G11B23/00; G11B23/0007
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2106350A
Cited
US2446479A
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US2378383A
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US2416353A
Cited
US2647169A
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US2628346A
Cited
US2700755A
Cited
US2679636A
Cited
US2756409A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-01-19 | 1962-07-21 | 1963-01-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-01-19 | 1966-07-21 | 1967-01-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-01-19 | 1970-07-21 | 1971-01-20 | $7700.00 | Window Closed / Lapsed |