US3454084A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Well head closure assembly
Assignee: Otis Engineering Corp
•
Filing: 1967-10-10
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Granted: 1969-07-08
•
Expires: 1987-10-10
Abstract
No abstract record available.
Inventors
- 👤 Phillip S Sizer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 09:02
CPC Classifications
E; E21; E21B; E21B23/00; E21B23/08; E21B33/00; E21B33/02; E21B33/03; E21B33/04; E21B33/047; E21B34/00; E21B34/02; E21B34/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3102591A
Cited
US3064735A
Cited
US3189097A
Cited
US3347311A
Cited
US3353595A
Cited
US3332493A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-07-07 | 1973-01-06 | 1973-07-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-07-07 | 1977-01-06 | 1977-07-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-07-07 | 1981-01-06 | 1981-07-08 | $7700.00 | Window Closed / Lapsed |