US3500906A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Subsurface wellhead and connector
Assignee: Shell USA Inc
•
Filing: 1968-05-23
•
Granted: 1970-03-17
•
Expires: 1988-05-23
Abstract
No abstract record available.
Inventors
- 👤 William H Petersen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 02:17
CPC Classifications
E; E21; E21B; E21B33/00; E21B33/02; E21B33/03; E21B33/035; E21B33/038
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
DE34492C
Cited
US3062287A
Cited
US3163228A
Cited
US3236302A
Cited
US3179176A
Cited
US3353595A
Cited
US3316984A
Cited
US3322193A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-03-16 | 1973-09-15 | 1974-03-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-03-16 | 1977-09-15 | 1978-03-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-03-16 | 1981-09-15 | 1982-03-17 | $7700.00 | Window Closed / Lapsed |