US3478822A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Wellhead and seal arrangement
Assignee: Vetco Gray LLC
•
Filing: 1968-05-15
•
Granted: 1969-11-18
•
Expires: 1988-05-15
Abstract
No abstract record available.
Inventors
- 👤 Marvin L Holbert Jr
- 👤 John Slack
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 05:35
CPC Classifications
E; E21; E21B; E21B33/00; E21B33/02; E21B33/03; E21B33/04; E21B33/043; E21B2200/00; E21B2200/01
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3155401A
Cited
US3336978A
Cited
US3255823A
Cited
US3268243A
Cited
US3354962A
Cited
US3311168A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-11-17 | 1973-05-19 | 1973-11-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-11-17 | 1977-05-19 | 1977-11-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-11-17 | 1981-05-19 | 1981-11-18 | $7700.00 | Window Closed / Lapsed |