US3494420A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of operating a well installation
Assignee: PHILLIP S SIZER
•
Filing: 1968-10-31
•
Granted: 1970-02-10
•
Expires: 1988-10-31
Abstract
No abstract record available.
Inventors
- 👤 Phillip S Sizer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 19:16
CPC Classifications
E; E21; E21B; E21B23/00; E21B23/08; E21B43/00; E21B43/14
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3208529A
Cited
US3263753A
Cited
US3302721A
Cited
US3322192A
Cited
US3381753A
Cited
US3363693A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-02-09 | 1973-08-11 | 1974-02-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-02-09 | 1977-08-11 | 1978-02-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-02-09 | 1981-08-11 | 1982-02-10 | $7700.00 | Window Closed / Lapsed |