Patent US3362487A successfully refreshed from Google Patents.
US3362487A
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US
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Control for a hydraulically actuated choke in a drilling mud flow line
Assignee: Swaco Inc
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Filing: 1966-05-03
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Granted: 1968-01-09
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Expires: 1986-05-03
Abstract
No abstract record available.
Inventors
- 👤 Larry M Lindsey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 17:39
CPC Classifications
E; E21; E21B; E21B21/00; E21B21/08; E21B34/00; E21B34/02; E21B34/025
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1699227A
Cited
US1850423A
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US2425193A
Cited
US2590215A
Cited
US2592836A
Cited
US2786652A
Cited
US3213939A
Cited
US3316936A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-01-08 | 1971-07-10 | 1972-01-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-01-08 | 1975-07-10 | 1976-01-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-01-08 | 1979-07-10 | 1980-01-09 | $7700.00 | Window Closed / Lapsed |