US2667926A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for cementing wells
Assignee: Individual
•
Filing: 1948-08-12
•
Granted: 1954-02-02
•
Expires: 1968-08-12
Abstract
No abstract record available.
Inventors
- 👤 Thomas E Alexander
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 02:11
CPC Classifications
E; E21; E21B; E21B33/00; E21B33/10; E21B33/13; E21B33/14; E21B33/146; E21B34/00; E21B34/06; E21B34/14; E21B34/142
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2187480A
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US2187483A
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US2223442A
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US2344120A
Cited
US2431751A
Cited
US2380022A
Cited
US2526695A
Cited
US2384675A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-02-01 | 1957-08-03 | 1958-02-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-02-01 | 1961-08-03 | 1962-02-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-02-01 | 1965-08-03 | 1966-02-02 | $7700.00 | Window Closed / Lapsed |