Patent US1778830A successfully refreshed from Google Patents.
US1778830A
Expired / Lapsed
US
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Casing-centering device
Assignee: Individual
•
Filing: 1927-06-18
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Granted: 1930-10-21
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Expires: 1947-06-18
Abstract
No abstract record available.
Inventors
- 👤 Herschell R Irvine
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 05:29
CPC Classifications
E; E21; E21B; E21B17/00; E21B17/10; E21B17/1014; E21B17/1021; E21B17/1028
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) | 1933-10-20 | 1934-04-21 | 1934-10-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1937-10-20 | 1938-04-21 | 1938-10-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1941-10-20 | 1942-04-21 | 1942-10-21 | $7700.00 | Window Closed / Lapsed |