US3494588A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flexible sleeve-element valve
Assignee: Schlumberger Technology Corp
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Filing: 1968-01-22
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Granted: 1970-02-10
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Expires: 1988-01-22
Abstract
No abstract record available.
Inventors
- 👤 James W Kisling
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 05:10
CPC Classifications
E; E21; E21B; E21B34/00; E21B34/06; E21B34/08; E21B34/12; F; F16; F16K; F16K7/00; F16K7/02; F16K7/04; F16K7/07
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-02-09 | 1973-08-11 | 1974-02-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-02-09 | 1977-08-11 | 1978-02-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-02-09 | 1981-08-11 | 1982-02-10 | $7700.00 | Window Closed / Lapsed |