US3422902A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Well pack-off unit
Assignee: The Herschede Hall Clock Co
•
Filing: 1966-02-21
•
Granted: 1969-01-21
•
Expires: 1986-02-21
Abstract
No abstract record available.
Inventors
- 👤 Charles W Bouchillon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 13:13
CPC Classifications
E; E21; E21B; E21B33/00; E21B33/10; E21B33/12; E21B33/126
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3104883A
Cited
US2069212A
Cited
US2063839A
Cited
US2686092A
Cited
US2656229A
Cited
US3053321A
Cited
US3179022A
Cited
US3330569A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-01-21 | 1972-07-22 | 1973-01-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-01-21 | 1976-07-22 | 1977-01-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-01-21 | 1980-07-22 | 1981-01-21 | $7700.00 | Window Closed / Lapsed |