Patent US3456440A successfully refreshed from Google Patents.
US3456440A
Expired / Lapsed
US
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Gas generating system
Assignee: Northrop Grumman Corp
•
Filing: 1966-11-09
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Granted: 1969-07-22
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Expires: 1986-11-09
Abstract
No abstract record available.
Inventors
- 👤 Walter F Keller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 11:55
CPC Classifications
F; F02; F02K; F02K9/00; F02K9/42; F02K9/60; F02K9/62; F02K9/72
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3101589A
Cited
US3315472A
Cited
US3231002A
Cited
US3166898A
Cited
US3203172A
Cited
US3214906A
Cited
US3274775A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-07-21 | 1973-01-20 | 1973-07-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-07-21 | 1977-01-20 | 1977-07-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-07-21 | 1981-01-20 | 1981-07-22 | $7700.00 | Window Closed / Lapsed |