Patent US3424477A successfully refreshed from Google Patents.
US3424477A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Well apparatus
Assignee: FMC Corp
•
Filing: 1965-06-16
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Granted: 1969-01-28
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Expires: 1985-06-16
Abstract
No abstract record available.
Inventors
- 👤 Samuel W Putch
- 👤 Lawrence A Eckert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 20:54
CPC Classifications
E; E21; E21B; E21B33/00; E21B33/02; E21B33/03; E21B33/04; E21B33/043
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2035834A
Cited
US2410589A
Cited
US2729293A
Cited
US2862560A
Cited
US3090438A
Cited
US3099317A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-01-28 | 1972-07-29 | 1973-01-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-01-28 | 1976-07-29 | 1977-01-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-01-28 | 1980-07-29 | 1981-01-28 | $7700.00 | Window Closed / Lapsed |