Patent US2441790A successfully refreshed from Google Patents.
US2441790A
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US
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Dimpling apparatus
Assignee: Individual
•
Filing: 1944-05-24
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Granted: 1948-05-18
•
Expires: 1964-05-24
Abstract
No abstract record available.
Inventors
- 👤 Frank B Bolte
- 👤 Philip B Keller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 22:02
CPC Classifications
B; B21; B21D; B21D22/00; B21D22/02; B21D22/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US485405A
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GB155204A
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GB454733A
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US2114289A
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US2356526A
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US2292446A
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US2302772A
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US2288378A
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US2365918A
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US2333418A
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US2348875A
Cited
US2418736A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-05-18 | 1951-11-17 | 1952-05-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-05-18 | 1955-11-17 | 1956-05-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-05-18 | 1959-11-17 | 1960-05-18 | $7700.00 | Window Closed / Lapsed |