US3561811A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Well pipe racker
Assignee: Jackson Memorial Hospital
•
Filing: 1968-05-23
•
Granted: 1971-02-09
•
Expires: 1988-05-23
Abstract
Abstract A WELL DRILLING RIG HAVING PIPE RACKER APPARATUS IN WHICH A NUMBER OF RACKER ARMS ARE CONTROLLABLE FROM A REMOTE LOCATION TO ENGAE DRILL PIPE TOOL JOINTS AND DRILL COLLARS, ONE OF THE ARMS HAVING A HEAD FOR SUPPORTING THE WEIGHT OF LENGTHS OR STANDS OF PIPE OR DRILL COLLARS BEING ADDED TO OR REMOVED FROM THE DRILL STRING, WHILE THE ARMS ARE RETRACTED OR EXTENDED AND MOVED TO PLACE SUCH STANDS IN THE RACK THEREFOR IN VERTICAL RELATION OR TO REMOVE SUCH STANDS FROM THE RACK THEREFOR AND POSITION THE STANDS OVER THE WELL FOR CONNECTION TO THE DRILL STRING EXTENDING INTO THE WELL.
Inventors
- 👤 John W Turner Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 00:03
CPC Classifications
E; E21; E21B; E21B19/00; E21B19/14
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-02-08 | 1974-08-10 | 1975-02-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-08 | 1978-08-10 | 1979-02-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-08 | 1982-08-10 | 1983-02-09 | $7700.00 | Window Closed / Lapsed |