Patent US3518013A successfully refreshed from Google Patents.
US3518013A
Expired / Lapsed
US
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Densitometer
Assignee: Northrop Grumman Guidance and Electronics Co Inc
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Filing: 1966-09-26
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Granted: 1970-06-30
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Expires: 1986-09-26
Abstract
No abstract record available.
Inventors
- 👤 Lloyd Clifford Sanford
- 👤 John A O'brien
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 16:37
CPC Classifications
G; G01; G01N; G01N21/00; G01N21/17; G01N21/59; G01N21/5907; G01N21/5911; G01J; G01J1/00; G01J1/42
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2550648A
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US2762278A
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US2972925A
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US3026764A
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US3035771A
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US3096137A
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US3023664A
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US3241432A
Cited
US3270348A
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US3246334A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-06-29 | 1973-12-29 | 1974-06-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-06-29 | 1977-12-29 | 1978-06-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-06-29 | 1981-12-29 | 1982-06-30 | $7700.00 | Window Closed / Lapsed |