US2647582A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for cementing wells
Assignee: BROWN
•
Filing: 1949-02-09
•
Granted: 1953-08-04
•
Expires: 1969-02-09
Abstract
No abstract record available.
Inventors
- 👤 Cicero C Brown
- 👤 Ernest L Potts
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 22:11
CPC Classifications
E; E21; E21B; E21B33/00; E21B33/02; E21B33/03; E21B33/04; E21B33/05
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1875266A
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US1662311A
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US1791874A
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US1772871A
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US2277510A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-08-03 | 1957-02-02 | 1957-08-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-08-03 | 1961-02-02 | 1961-08-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-08-03 | 1965-02-02 | 1965-08-04 | $7700.00 | Window Closed / Lapsed |