US2498686A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Machine for flanging cylindrical shells
Assignee: Struthers Wells Corp
•
Filing: 1946-06-10
•
Granted: 1950-02-28
•
Expires: 1966-06-10
Abstract
No abstract record available.
Inventors
- 👤 Leon H Johnson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 22:04
CPC Classifications
B; B21; B21D; B21D19/00; B21D19/02; B21D19/04; B21D19/046
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US738428A
Cited
GB191518201A
Cited
AT77053B
Cited
US1499499A
Cited
US1953842A
Cited
US2427003A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-02-27 | 1953-08-29 | 1954-02-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-02-27 | 1957-08-29 | 1958-02-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-02-27 | 1961-08-29 | 1962-02-28 | $7700.00 | Window Closed / Lapsed |