US3396448A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Methods for manufacture of flexible valve elements
Assignee: Schlumberger Technology Corp
•
Filing: 1965-09-29
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Granted: 1968-08-13
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Expires: 1985-09-29
Abstract
No abstract record available.
Inventors
- 👤 Iii James W Kisling
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 00:31
CPC Classifications
E; E21; E21B; E21B34/00; E21B34/06; E21B34/12; E21B34/08; F; F16; F16K; F16K7/00; F16K7/02; F16K7/04; F16K7/07; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49405; Y10T29/49412
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2995335A
Cited
US3203662A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-08-13 | 1972-02-12 | 1972-08-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-08-13 | 1976-02-12 | 1976-08-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-08-13 | 1980-02-12 | 1980-08-13 | $7700.00 | Window Closed / Lapsed |