US2857970A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic fishing tool
Assignee: Individual
•
Filing: 1954-07-02
•
Granted: 1958-10-28
•
Expires: 1974-07-02
Abstract
No abstract record available.
Inventors
- 👤 Orren B Hopkins
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 17:54
CPC Classifications
E; E21; E21B; E21B31/00; E21B31/06
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2734767A
Cited
US1158292A
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US2139075A
Cited
US2431361A
Cited
US2449720A
Cited
US2539435A
Cited
US2657752A
Cited
US2668077A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-10-27 | 1962-04-28 | 1962-10-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-10-27 | 1966-04-28 | 1966-10-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-10-27 | 1970-04-28 | 1970-10-28 | $7700.00 | Window Closed / Lapsed |