US3397745A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vacuum-insulated steam-injection system for oil wells
Assignee: Individual
•
Filing: 1966-03-08
•
Granted: 1968-08-20
•
Expires: 1986-03-08
Abstract
No abstract record available.
Inventors
- 👤 Carl W Owens
- 👤 Benjamin D Owens
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 05:49
CPC Classifications
E; E21; E21B; E21B36/00; E21B36/003
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1413197A
Cited
US1780428A
Cited
US2803432A
Cited
US3018827A
Cited
US3142336A
Cited
US3280909A
Cited
US3306356A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-08-20 | 1972-02-19 | 1972-08-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-08-20 | 1976-02-19 | 1976-08-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-08-20 | 1980-02-19 | 1980-08-20 | $7700.00 | Window Closed / Lapsed |