US2422883A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for flanging sheet metal
Assignee: Douglas Aircraft Co Inc
•
Filing: 1942-01-24
•
Granted: 1947-06-24
•
Expires: 1962-01-24
Abstract
No abstract record available.
Inventors
- 👤 Henry H Bruderlin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 12:53
CPC Classifications
B; B21; B21D; B21D22/00; B21D22/10
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1048775A
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US1655568A
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GB333104A
Cited
US1881517A
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US2132002A
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US2133445A
Cited
US2248786A
Cited
US2190659A
Cited
US2317869A
Cited
US2321075A
Cited
US2342365A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-06-23 | 1950-12-23 | 1951-06-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-06-23 | 1954-12-23 | 1955-06-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-06-23 | 1958-12-23 | 1959-06-24 | $7700.00 | Window Closed / Lapsed |