US3435897A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Well tool with hydraulic impedance mechanism and rotary ball valve
Assignee: Halliburton Co
•
Filing: 1966-12-23
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Granted: 1969-04-01
•
Expires: 1986-12-23
Abstract
No abstract record available.
Inventors
- 👤 Burchus Q Barrington
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 10:15
CPC Classifications
E; E21; E21B; E21B34/00; E21B34/06; E21B34/14; E21B23/00; E21B23/004; E21B23/006; E21B34/12; E21B34/125; E21B43/00; E21B43/12; E21B2200/00; E21B2200/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2703696A
Cited
US2740479A
Cited
US3007524A
Cited
US3249124A
Cited
US3310114A
Cited
US3332495A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-03-31 | 1972-09-30 | 1973-04-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-03-31 | 1976-09-30 | 1977-04-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-03-31 | 1980-09-30 | 1981-04-01 | $7700.00 | Window Closed / Lapsed |