Patent US2421732A successfully refreshed from Google Patents.
US2421732A
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US
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Tool for dimpling
Assignee: Lockheed Martin Corp
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Filing: 1943-11-19
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Granted: 1947-06-03
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Expires: 1963-11-19
Abstract
No abstract record available.
Inventors
- 👤 Orrin W Albert
- 👤 David A Webster
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 19:47
CPC Classifications
B; B21; B21D; B21D22/00; B21D22/02; B21D22/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1394506A
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US1612156A
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US2168377A
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GB511106A
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US2338736A
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US2268787A
Cited
US2265331A
Cited
US2288378A
Cited
US2328919A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-06-02 | 1950-12-02 | 1951-06-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-06-02 | 1954-12-02 | 1955-06-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-06-02 | 1958-12-02 | 1959-06-03 | $7700.00 | Window Closed / Lapsed |