Patent US2728397A successfully refreshed from Google Patents.
US2728397A
Expired / Lapsed
US
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Subsurface sampler
Assignee: Ruska Instrument Corp
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Filing: 1951-03-19
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Granted: 1955-12-27
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Expires: 1971-03-19
Abstract
No abstract record available.
Inventors
- 👤 Ruska Walter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 15:56
CPC Classifications
E; E21; E21B; E21B49/00; E21B49/08; E21B49/081; E21B49/082
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
175 words
A SAMPLE TAKING DEVICE FOR WELLS COMPRISING, A HOUSING INCLUDING A FLUID TIGHT UPPER COMPARTMENT AND A LOWER COMPARTMENT, A PARTITION SEPARATING SAID COMPARTMENTS, AN UPPER MAGNET MOVABLE IN SAID UPPER COMPARTMENT TOWARDS SAID PARTITION, A SECOND MAGNET MOVABLE IN SAID LOWER COMPARTMENT BY THE MUTUAL ATTRACTION OF SAID MAGNETS WHEN THE UPPER MAGNET IS AT THE PARTITION, YIELDABLE MEANS IN SAID COMPARTMENT INITIALLY LOCATING SAID UPPER MAGNET SPACED ABOVE SAID PARTITION, A SAMPLE CHAMBER IN SAID LOWER COMPARTMENT HAVING A PORT THEREIN SAMPLE CHAMBER, A FLUID PRESSURE RESPONSIVE PORT CLOSING SAMPLE CHAMBER, A FLUID PRESSURE RESPONSIVE PORT CLOSING VALVE, LOCK MEANS OPERATIVE FOR INITIALLY HOLDING SAID VALVE OPEN, A TIMING DEVICE IN SAID UPPER COMPARTMENT OPERABLE AFTER A PREDETERMINED TIME INTERVAL TO RELEASE SAID UPPER MAGNET LOCATING MEANS TO SET SAID UPPER MAGNET IN MOTION DOWNWARDLY IN SAID UPPER COMPARTMENT TOWARD SAID PARTITION TO DRAW SAID LOWER MAGNET UPWARDLY THERETO, AND A RELEASABLE LATCH CONNECTED WITH THE LOWER MAGNET AND RESPONSIVE TO UPWARD MOVEMENT OF THE LOWER MAGNET FOR RENDERING SAID LOCK MEANS INOPERATIVE.
Claim 2
Dependent Claim
175 words
A SAMPLE TAKING DEVICE FOR WELLS COMPRISING, A HOUSING INCLUDING A FLUID TIGHT UPPER COMPARTMENT AND A LOWER COMPARTMENT, A PARTITION SEPARATING SAID COMPARTMENTS, AN UPPER MAGNET MOVABLE IN SAID UPPER COMPARTMENT TOWARDS SAID PARTITION, A SECOND MAGNET MOVABLE IN SAID LOWER COMPARTMENT BY THE MUTUAL ATTRACTION OF SAID MAGNETS WHEN THE UPPER MAGNET IS AT THE PARTITION, YIELDABLE MEANS IN SAID COMPARTMENT INITIALLY LOCATING SAID UPPER MAGNET SPACED ABOVE SAID PARTITION, A SAMPLE CHAMBER IN SAID LOWER COMPARTMENT HAVING A PORT THEREIN SAMPLE CHAMBER, A FLUID PRESSURE RESPONSIVE PORT CLOSING SAMPLE CHAMBER, A FLUID PRESSURE RESPONSIVE PORT CLOSING VALVE, LOCK MEANS OPERATIVE FOR INITIALLY HOLDING SAID VALVE OPEN, A TIMING DEVICE IN SAID UPPER COMPARTMENT OPERABLE AFTER A PREDETERMINED TIME INTERVAL TO RELEASE SAID UPPER MAGNET LOCATING MEANS TO SET SAID UPPER MAGNET IN MOTION DOWNWARDLY IN SAID UPPER COMPARTMENT TOWARD SAID PARTITION TO DRAW SAID LOWER MAGNET UPWARDLY THERETO, AND A RELEASABLE LATCH CONNECTED WITH THE LOWER MAGNET AND RESPONSIVE TO UPWARD MOVEMENT OF THE LOWER MAGNET FOR RENDERING SAID LOCK MEANS INOPERATIVE.
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) | 1958-12-26 | 1959-06-27 | 1959-12-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-12-26 | 1963-06-27 | 1963-12-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-12-26 | 1967-06-27 | 1967-12-27 | $7700.00 | Window Closed / Lapsed |