Patent US1930381A successfully refreshed from Google Patents.
US1930381A
Expired / Lapsed
US
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Centrifugal oil well pump
Assignee: MAGIC CITY SPECIALTY Co
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Filing: 1931-11-17
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Granted: 1933-10-10
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Expires: 1951-11-17
Abstract
No abstract record available.
Inventors
- 👤 Charles G Boone
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 15:44
CPC Classifications
F; F04; F04D; F04D13/00; F04D13/02; F04D13/04; E; E21; E21B; E21B43/00; E21B43/12; E21B43/121; E21B43/129; F04D1/00; F04D1/06; F04D29/00; F04D29/40; F04D29/42; F04D29/44; F04D29/445
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) | 1936-10-09 | 1937-04-10 | 1937-10-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1940-10-09 | 1941-04-10 | 1941-10-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1944-10-09 | 1945-04-10 | 1945-10-10 | $7700.00 | Window Closed / Lapsed |