Patent US3247672A successfully refreshed from Google Patents.
US3247672A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Underwater well head encasement structure
Assignee: Individual
•
Filing: 1962-08-29
•
Granted: 1966-04-26
•
Expires: 1982-08-29
Abstract
No abstract record available.
Inventors
- 👤 Vincent C Johnson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 16:25
CPC Classifications
B; B63; B63C; B63C11/00; B63C11/34; B63C11/44; E; E21; E21B; E21B33/00; E21B33/02; E21B33/03; E21B33/035; E21B33/037; E21B43/00; E21B43/01; E21B43/017
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US734153A
Cited
US763708A
Cited
US871655A
Cited
US876392A
Cited
US891966A
Cited
US2413243A
Cited
US2661600A
Cited
US2669431A
Cited
US2624931A
Cited
US2854215A
Cited
US2988144A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-04-25 | 1969-10-25 | 1970-04-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-04-25 | 1973-10-25 | 1974-04-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-04-25 | 1977-10-25 | 1978-04-26 | $7700.00 | Window Closed / Lapsed |