US2424643A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for dimpling sheet material and preheating the area to be dimpled
Assignee: Bell Aircraft Corp
•
Filing: 1945-02-14
•
Granted: 1947-07-29
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Expires: 1965-02-14
Abstract
No abstract record available.
Inventors
- 👤 William W Williams
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 00:01
CPC Classifications
B; B21; B21D; B21D22/00; B21D22/02; B21D22/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US289837A
Cited
US493897A
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DE378419C
Cited
DE602570C
Cited
US1580931A
Cited
GB218840A
Cited
US1636111A
Cited
US2372516A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-07-28 | 1951-01-27 | 1951-07-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-07-28 | 1955-01-27 | 1955-07-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-07-28 | 1959-01-27 | 1959-07-29 | $7700.00 | Window Closed / Lapsed |