USRE28131E
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ball valve with resilient seal
Assignee: —
•
Filing: 1973-10-26
•
Granted: 1974-08-20
•
Expires: 1993-10-26
Abstract
Abstract A BALL VALVE IS INCORPORATED IN A SUBSURFACE SHUTON VALVE FOR WELLS. THE BALL VALVE IS ACTUATED ROTATIVELY AND LONGITUDINALLY WITHIN ITS SUPPORT AND EFFECTS SEALING ENGAGEMENT WITH A STATIONARY RESILIENT SEAL BY LONGITUDINAL MOVEMENT.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 01:40
CPC Classifications
E; E21; E21B; E21B34/00; E21B34/06; E21B34/10; E21B2200/00; E21B2200/04; Y; Y10; Y10T; Y10T137/00; Y10T137/8593; Y10T137/86928; Y10T137/86936
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-08-19 | 1978-02-18 | 1978-08-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-08-19 | 1982-02-18 | 1982-08-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-08-19 | 1986-02-18 | 1986-08-20 | $7700.00 | Window Closed / Lapsed |