US2856820A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rocket launching means
Assignee: Northrop Grumman Corp
•
Filing: 1954-04-26
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Granted: 1958-10-21
•
Expires: 1974-04-26
Abstract
No abstract record available.
Inventors
- 👤 Schmued Edgar
- 👤 Julius G Villepigue
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 10:38
CPC Classifications
F; F42; F42C; F42C15/00; F42C15/24; F42C15/26; B; B64; B64D; B64D1/00; B64D1/02; B64D1/04; F41; F41F; F41F3/00; F41F3/04; F41F3/048; F41F3/06
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
GB189325005A
Cited
GB672346A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-10-20 | 1962-04-21 | 1962-10-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-10-20 | 1966-04-21 | 1966-10-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-10-20 | 1970-04-21 | 1970-10-21 | $7700.00 | Window Closed / Lapsed |