Patent US1918522A successfully refreshed from Google Patents.
US1918522A
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US
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Expanding mandrel
Assignee: EARL H MCKEEN
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Filing: 1931-08-18
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Granted: 1933-07-18
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Expires: 1951-08-18
Abstract
No abstract record available.
Inventors
- 👤 Hubert R Crane
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 22:10
CPC Classifications
B; B23; B23B; B23B31/00; B23B31/40; Y; Y10; Y10T; Y10T279/00; Y10T279/10; Y10T279/1074; Y10T279/1079; Y10T82/00; Y10T82/26; Y10T82/266; Y10T82/268
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) | 1936-07-17 | 1937-01-16 | 1937-07-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1940-07-17 | 1941-01-16 | 1941-07-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1944-07-17 | 1945-01-16 | 1945-07-18 | $7700.00 | Window Closed / Lapsed |