Patent US2894469A successfully refreshed from Google Patents.
US2799348A
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Well cementing apparatus
Assignee: Individual
•
Filing: 1953-06-08
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Granted: 1957-07-16
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Expires: 1973-06-08
Abstract
No abstract record available.
Inventors
- 👤 John S Page
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 16:00
CPC Classifications
E; E21; E21B; E21B23/00; E21B23/04; E21B23/0411; E21B23/04115; E21B33/00; E21B33/10; E21B33/13; E21B33/134
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2603292A
Cited
US1870697A
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US1951638A
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US2352700A
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US2658459A
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US2606618A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-07-15 | 1961-01-14 | 1961-07-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-07-15 | 1965-01-14 | 1965-07-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-07-15 | 1969-01-14 | 1969-07-16 | $7700.00 | Window Closed / Lapsed |