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US2709941A
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US
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Two-part holding keys
Assignee: Electric Steel Foundry Co
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Filing: 1951-06-23
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Granted: 1955-06-07
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Expires: 1971-06-23
Abstract
No abstract record available.
Inventors
- 👤 Paul V Larsen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 15:02
CPC Classifications
F; F16; F16B; F16B3/00; E; E02; E02F; E02F9/00; E02F9/28; E02F9/2808; E02F9/2816; E02F9/2833
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US664027A
Cited
US925189A
Cited
US1780397A
Cited
US2064059A
Cited
US2055265A
Cited
US2242793A
Cited
US2292128A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-06-06 | 1958-12-06 | 1959-06-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-06-06 | 1962-12-06 | 1963-06-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-06-06 | 1966-12-06 | 1967-06-07 | $7700.00 | Window Closed / Lapsed |