US3426845A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Well head system and method of installing the same
Assignee: Otis Engineering Corp
•
Filing: 1965-11-29
•
Granted: 1969-02-11
•
Expires: 1985-11-29
Abstract
No abstract record available.
Inventors
- 👤 William W Dollison
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 14:36
CPC Classifications
E; E21; E21B; E21B33/00; E21B33/02; E21B33/03; E21B33/04; E21B33/047; E21B34/00; E21B34/02; E21B34/04; E21B2200/00; E21B2200/04
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US2785755A
Cited
US3280914A
Cited
US3259191A
Cited
US3064735A
Cited
US3307627A
Cited
US3156300A
Cited
US3310107A
Cited
US3318377A
Cited
US3322192A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-02-11 | 1972-08-12 | 1973-02-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-02-11 | 1976-08-12 | 1977-02-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-02-11 | 1980-08-12 | 1981-02-11 | $7700.00 | Window Closed / Lapsed |