US2441790A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dimpling apparatus
Assignee: Individual
•
Filing: 1944-05-24
•
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 12:21
CPC Classifications
B; B21; B21D; B21D22/00; B21D22/02; B21D22/04
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US485405A
Cited
GB155204A
Cited
GB454733A
Cited
US2114289A
Cited
US2356526A
Cited
US2292446A
Cited
US2302772A
Cited
US2288378A
Cited
US2365918A
Cited
US2333418A
Cited
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 |