Patent US3400980A successfully refreshed from Google Patents.
US3400980A
Expired / Lapsed
US
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Apparatus for inserting down hole mechanism through bore holes
Assignee: Kalium Chemicals Ltd
•
Filing: 1966-03-11
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Granted: 1968-09-10
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Expires: 1986-03-11
Abstract
No abstract record available.
Inventors
- 👤 James B Dahms
- 👤 Byron P Edmonds
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 06:12
CPC Classifications
E; E21; E21B; E21B43/00; E21B43/29; E21B43/292
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2198821A
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US2253224A
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US2293974A
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US2822158A
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US2693342A
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US3191697A
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US2903069A
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US3054455A
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US3189107A
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US3297362A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-09-10 | 1972-03-11 | 1972-09-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-09-10 | 1976-03-11 | 1976-09-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-09-10 | 1980-03-11 | 1980-09-10 | $7700.00 | Window Closed / Lapsed |