US2589337A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Liner hanger
Assignee: Individual
•
Filing: 1948-11-16
•
Granted: 1952-03-18
•
Expires: 1968-11-16
Abstract
No abstract record available.
Inventors
- 👤 Burns Erwin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 09:42
CPC Classifications
E; E21; E21B; E21B43/00; E21B43/02; E21B43/10
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2228503A
Cited
US2337733A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-03-18 | 1955-09-17 | 1956-03-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-03-18 | 1959-09-17 | 1960-03-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-03-18 | 1963-09-17 | 1964-03-18 | $7700.00 | Window Closed / Lapsed |