US2547057A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polishing machine for impeller wheels
Assignee: Northrop Grumman Space and Mission Systems Corp
•
Filing: 1948-04-06
•
Granted: 1951-04-03
•
Expires: 1968-04-06
Abstract
No abstract record available.
Inventors
- 👤 Henry C Stieglitz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 19:33
CPC Classifications
B; B24; B24B; B24B19/00; B24B19/14
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US306772A
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US500710A
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US1308933A
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US1413928A
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US894807A
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US1227622A
Cited
US1800307A
Cited
US2447102A
Cited
US2484906A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-04-02 | 1954-10-02 | 1955-04-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-04-02 | 1958-10-02 | 1959-04-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-04-02 | 1962-10-02 | 1963-04-03 | $7700.00 | Window Closed / Lapsed |