Patent US2667644A successfully refreshed from Google Patents.
US2667644A
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Anatomical knee and hydraulic snubber
Assignee: Northrop Grumman Corp
•
Filing: 1948-07-03
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Granted: 1954-02-02
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Expires: 1968-07-03
Abstract
No abstract record available.
Inventors
- 👤 Orvin S Johnson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 09:20
CPC Classifications
A; A61; A61F; A61F2/00; A61F2/50; A61F2/60; A61F2/64; A61F2/642; A61F2/644; A61F2/604; A61F2/68; A61F2/74; A61F2/744; A61F2/748; A61F2/66; A61F2/6607; A61F2002/5072; A61F2002/5073; A61F2002/6614; A61F2002/6818
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
DE316515C
Cited
US1312599A
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US37087A
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US1390915A
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FR530623A
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FR523329A
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FR530887A
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US1421216A
Cited
US2208275A
Cited
US2175136A
Cited
US2478721A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-02-01 | 1957-08-03 | 1958-02-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-02-01 | 1961-08-03 | 1962-02-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-02-01 | 1965-08-03 | 1966-02-02 | $7700.00 | Window Closed / Lapsed |