Patent US2781831A successfully refreshed from Google Patents.
US2781831A
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Pumping assembly
Assignee: Northrop Grumman Space and Mission Systems Corp
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Filing: 1952-09-11
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Granted: 1957-02-19
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Expires: 1972-09-11
Abstract
No abstract record available.
Inventors
- 👤 Pierce T Angell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 18:14
CPC Classifications
F; F04; F04D; F04D13/00; F04D13/12; F04D13/14; B; B64; B64D; B64D37/00; B64D37/02; B64D37/14; B64D37/16; F04D13/02; F04D13/04; F04D9/00; F04D9/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2238502A
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US2363528A
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US2395657A
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US2383650A
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US2418720A
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US2398106A
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US2609659A
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US2610464A
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US2630069A
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US2592938A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-02-19 | 1960-08-20 | 1961-02-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-02-19 | 1964-08-20 | 1965-02-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-02-19 | 1968-08-20 | 1969-02-19 | $7700.00 | Window Closed / Lapsed |