Patent US2560901A successfully refreshed from Google Patents.
US2560901A
Expired / Lapsed
US
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Cementing plug
Assignee: INTERNAT CEMENTERS Inc
•
Filing: 1945-08-18
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Granted: 1951-07-17
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Expires: 1965-08-18
Abstract
No abstract record available.
Inventors
- 👤 Frank D Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 18:37
CPC Classifications
E; E21; E21B; E21B33/00; E21B33/10; E21B33/13; E21B33/14; E21B33/16
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USRE19952E
Cited
US1569293A
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US1884165A
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US1994072A
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US2197396A
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US2232688A
Cited
US2295418A
Cited
US2352744A
Cited
US2382578A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-07-16 | 1955-01-15 | 1955-07-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-07-16 | 1959-01-15 | 1959-07-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-07-16 | 1963-01-15 | 1963-07-17 | $7700.00 | Window Closed / Lapsed |