US3384178A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automatic hole filler and indicator
Assignee: Gulf Oil Corp
•
Filing: 1966-09-14
•
Granted: 1968-05-21
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Expires: 1986-09-14
Abstract
No abstract record available.
Inventors
- 👤 James W Agnew
- 👤 Morris E Henderson
- 👤 Bernie B Metcalf
- 👤 Fred A Westmoreland
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 09:06
CPC Classifications
E; E21; E21B; E21B21/00; E21B21/08
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) | 1971-05-21 | 1971-11-20 | 1972-05-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-05-21 | 1975-11-20 | 1976-05-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-05-21 | 1979-11-20 | 1980-05-21 | $7700.00 | Window Closed / Lapsed |