Patent US2976931A successfully refreshed from Google Patents.
US2976931A
Expired / Lapsed
US
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Well connector device
Assignee: Camco Inc
•
Filing: 1956-02-20
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Granted: 1961-03-28
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Expires: 1976-02-20
Abstract
No abstract record available.
Inventors
- 👤 Douglas E Daffin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 04:45
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)
USRE20546E
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US2054322A
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US2249511A
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US2378469A
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US2401119A
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US2673614A
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US2698056A
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US2737245A
Cited
US2778433A
Cited
US2816613A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-03-27 | 1964-09-26 | 1965-03-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-03-27 | 1968-09-26 | 1969-03-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-03-27 | 1972-09-26 | 1973-03-28 | $7700.00 | Window Closed / Lapsed |