Patent US2981335A successfully refreshed from Google Patents.
US2981335A
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US
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Method and apparatus for introducing sealing elements into well casings
Assignee: Western Company of North America
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Filing: 1957-06-26
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Granted: 1961-04-25
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Expires: 1977-06-26
Abstract
No abstract record available.
Inventors
- 👤 Billy J Bucy
- 👤 Charles M Simmons
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 18:17
CPC Classifications
E; E21; E21B; E21B33/00; E21B33/02; E21B33/03; E21B33/068
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1238895A
Cited
US2642268A
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US2601852A
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US2698582A
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US2752067A
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US2790500A
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US2754910A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-04-24 | 1964-10-24 | 1965-04-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-04-24 | 1968-10-24 | 1969-04-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-04-24 | 1972-10-24 | 1973-04-25 | $7700.00 | Window Closed / Lapsed |