US3512554A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automatic purge valve for remote hydraulic control system
Assignee: ExxonMobil Upstream Research Co
•
Filing: 1967-12-18
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Granted: 1970-05-19
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Expires: 1987-12-18
Abstract
No abstract record available.
Inventors
- 👤 Thomas W Childers
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 06:34
CPC Classifications
E; E21; E21B; E21B33/00; E21B33/02; E21B33/03; E21B33/035; E21B33/0355; E21B41/00; E21B41/0007; Y; Y10; Y10T; Y10T137/00; Y10T137/0318; Y10T137/0402; Y10T137/0419; Y10T137/0424; Y10T137/2496; Y10T137/2559; Y10T137/265; Y10T137/2668; Y10T137/4891; Y10T137/8593; Y10T137/86493; Y10T137/86879
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3001543A
Cited
US3100497A
Cited
US3265083A
Cited
US3331384A
Cited
US3358705A
Cited
US3439697A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-05-18 | 1973-11-17 | 1974-05-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-05-18 | 1977-11-17 | 1978-05-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-05-18 | 1981-11-17 | 1982-05-19 | $7700.00 | Window Closed / Lapsed |