US2699697A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mandrel changing apparatus
Assignee: United States Steel Corp
•
Filing: 1951-02-07
•
Granted: 1955-01-18
•
Expires: 1971-02-07
Abstract
No abstract record available.
Inventors
- 👤 John W Kelso
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 17:47
CPC Classifications
B; B21; B21B; B21B25/00; B21B25/06
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US184168A
Cited
US426046A
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US744071A
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US1302861A
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FR503970A
Cited
US1764736A
Cited
US2191143A
Cited
US2583834A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-01-17 | 1958-07-19 | 1959-01-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-01-17 | 1962-07-19 | 1963-01-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-01-17 | 1966-07-19 | 1967-01-18 | $7700.00 | Window Closed / Lapsed |