Patent US2920581A successfully refreshed from Google Patents.
US2920581A
Expired / Lapsed
US
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Assignee: Curtiss Wright Corp
•
Filing: 1957-11-22
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Granted: 1960-01-12
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Expires: 1977-11-22
Abstract
No abstract record available.
Inventors
- 👤 Howard L Cook
- 👤 Charles W Canada
- 👤 Billy L Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 19:22
CPC Classifications
B; B65; B65G; B65G9/00; B65G9/002; B65G47/00; B65G47/22; B65G47/24; B65G47/248; B65G9/008
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US660999A
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US827829A
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US897388A
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US1089280A
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US1178196A
Cited
US1328523A
Cited
AT121134B
Cited
US1958162A
Cited
US2184860A
Cited
US2146289A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-01-11 | 1963-07-13 | 1964-01-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-01-11 | 1967-07-13 | 1968-01-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-01-11 | 1971-07-13 | 1972-01-12 | $7700.00 | Window Closed / Lapsed |