Patent US2868438A successfully refreshed from Google Patents.
US2868438A
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US
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Assignee: Northrop Grumman Space and Mission Systems Corp
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Filing: 1956-04-17
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Granted: 1959-01-13
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Expires: 1976-04-17
Abstract
No abstract record available.
Inventors
- 👤 Howard M Gammon
- 👤 Sampietro Achilles Charles
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 10:15
CPC Classifications
F; F04; F04D; F04D25/00; F04D25/02; F04D25/022; F25; F25B; F25B1/00; F25B1/04; F25B1/053
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) | 1962-01-12 | 1962-07-14 | 1963-01-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-01-12 | 1966-07-14 | 1967-01-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-01-12 | 1970-07-14 | 1971-01-13 | $7700.00 | Window Closed / Lapsed |