Patent US289311A successfully refreshed from Google Patents.
Patent US3702223A successfully refreshed from Google Patents.
US3702223A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydraulically operated system for subsurface operations
Assignee: Viking Explosives and Supply Inc
•
Filing: 1971-10-07
•
Granted: 1972-11-07
•
Expires: 1991-10-07
Abstract
Abstract PROVISION IS MADE FOR REMOVAL OF BLAST HOLE LIQUIDS HYDRAULICALLY THUS AVOIDING SAFETY HAZARDS OF ELECTRICALLY OPERATED APPARATUS IN BLASTING HOLES. HYDRAULICALLY DRIVEN SUBMERSIBLE PUMP MEANS ARE PROTECTED WITHIN ELECTRICALLY INSULATING BOOT MEANS AND CONNECTED THROUGH AN ABRASION RESISTANT, ELECTRICALLY NON-CONDUCTIVE SHEATHING CABLE WHICH HOUSES SUPPLY AND DISCHARGE CONDUITS. REELING MEANS AT THE SURFACE PROVIDE FOR LOWERING, RAISING, AND SUSPENDING OF THE SUBMERSIBLE APPARATUS WITH NOVEL JUNCTION BLOCK AND CONNECTOR MEANS PROVIDING ABOVE GROUND CONNECTION FOR THE CONDUIT MEANS WITHOUT INHIBITING OF REELING OF THE SHEATHING CABLE AND HOUSED CONDUITS.
Inventors
- 👤 David H Bednar
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 20:04
CPC Classifications
E; E21; E21B; E21B37/00; E21B19/00; E21B19/22
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) | 1975-11-07 | 1976-05-08 | 1976-11-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-11-07 | 1980-05-08 | 1980-11-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-11-07 | 1984-05-08 | 1984-11-07 | $7700.00 | Window Closed / Lapsed |