US3187238A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic bell nipple
Assignee: Individual
•
Filing: 1962-08-16
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Granted: 1965-06-01
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Expires: 1982-08-16
Abstract
No abstract record available.
Inventors
- 👤 Gerald G Wilson
- 👤 Homer W O'haver
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 20:25
CPC Classifications
E; E21; E21B; E21B41/00; E21B41/0021
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
146 words
A DEVICE FOR CATCHING MAGNETICALLY ATTRACTABLE ARTICLES WHICH MAY FALL INTO A VERTICALLY DISPOSED WELL BORE, THE DEVICE COMPRISING; AN ELONGATED CYLINDRICAL HOUSING HAVING A CYLINDRICAL INNER WALL AND A LONGITUDINAL PASSAGEWAY EXTENDING THERETHROUGH; MAGNET MEANS DISPOSED AROUND THE OUTER PERIPHERY OF THE CYLINDRICAL INNER WALL; GUIDE MEANS CONNECTED TO THE HOUSING FOR MAINTAINING AN ELONGATED TOOL PASSING THROUGH THE LONGITUDINAL PASSAGEWAY GENERALLY CENTERED AND SPACED FROM THE INNER WALL; AND, ANNULAR TRAP MEANS DISPOSED WITHIN THE HOUSING AND BELOW THE INNER WALL FOR CATCHING ARTICLES WHICH DROP FROM THE INNER WALL, WHEREBY FREE-FALLING, MAGNETICALLY ATTRACTABLE ARTICLES PASSING THROUGH THE INNER WALL WILL BE CAUGHT AND HELD AGAINST THE INNER WALL BY THE MAGNETIC FORCE OF ATTRACTION OF THE MAGNET MEANS AND THE ELONGATED TOOL WILL BE MAINTAINED IN SPACED RELATION TO THE INNER WALL SO AS NOT TO LOOSEN ARTICLES HELD AGAINST THE INNER WALL.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-05-31 | 1968-11-30 | 1969-06-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-05-31 | 1972-11-30 | 1973-06-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-05-31 | 1976-11-30 | 1977-06-01 | $7700.00 | Window Closed / Lapsed |