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US2980185A
Expired / Lapsed
US
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Retrievable well tool hanger
Assignee: Camco Inc
•
Filing: 1958-07-11
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Granted: 1961-04-18
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Expires: 1978-07-11
Abstract
No abstract record available.
Inventors
- 👤 Douglas E Daffin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 22:32
CPC Classifications
E; E21; E21B; E21B23/00; E21B23/02; Y; Y10; Y10S; Y10S285/00; Y10S285/922
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2401119A
Cited
US2671640A
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US2698056A
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US2778433A
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US2777523A
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US2816613A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-04-17 | 1964-10-17 | 1965-04-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-04-17 | 1968-10-17 | 1969-04-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-04-17 | 1972-10-17 | 1973-04-18 | $7700.00 | Window Closed / Lapsed |