Patent US2249257A successfully refreshed from Google Patents.
US2249257A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Casing construction
Assignee: Detroit Steel Products Co Inc
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Filing: 1940-02-16
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Granted: 1941-07-15
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Expires: 1960-02-16
Abstract
No abstract record available.
Inventors
- 👤 Mason P Rumney
- 👤 Clyde W Kelly
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 23:05
CPC Classifications
E; E06; E06B; E06B1/00; E06B1/04; E06B1/12; E06B1/18
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1944-07-14 | 1945-01-13 | 1945-07-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1948-07-14 | 1949-01-13 | 1949-07-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1952-07-14 | 1953-01-13 | 1953-07-15 | $7700.00 | Window Closed / Lapsed |