US2735654A
Expired / Lapsed
US
⏱️ 0.0 years remaining
hildebrandt
Assignee: —
•
Filing: —
•
Granted: 1956-02-21
•
Expires: 1973-02-21
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 02:42
CPC Classifications
E; E21; E21B; E21B7/00; E21B7/16
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
136 words
A DRILLING APPARATUS COMPRISING IN COMBINATION: A TUBULAR SUPPORT MEMBER, A PLURALITY OF CIRCUMFERENTIALLY ARRANGED SHROUD SEGMENTS HELD BY SAID SUPPORT MEMBER IN FLEXIBLE RELATION THERETO AND EXTENDING BELOW SAID SUPPORT MEMBER IN A MANNER DEFINING AN OPEN-BOTTOM SHROUD ADAPTED TO MAINTAIN A PLURALITY OF PELLETS IN CAPTIVE CIRCULATION THEREWITHIN, A FIRST NOZZLE ELEMENT SUPPORTED BY SAID TUBULAR MEMBER ADJACENT THE LOWER TERMINATION THEREOF AND ADAPTED TO EJECT THEREFROM A HIGH VELOCITY STREAM OF FLUID, A SECOND NOZZLE ELEMENT SUPPORTED BELOW SAID FIRST NOZZLE ELEMENT IN SPACED CONCENTRIC RELATION THEREWITH, SAID SECOND NOZZLE ELEMENT BEING SPACED FROM SAID SHROUD ELEMENTS AND FROM SAID FIRST NOZZLE ELEMENT TO PROVIDE FOR UPWARD PASSAGE OF PELLETS BETWEEN SAID SECOND NOZZLE ELEMENT AND SAID SHROUD AND FOR ENTRY OF PELLETS INTO THE TOP OF SAID SECOND NOZZLE, MEANS BIASING SAID
Claim 2
Dependent Claim
136 words
A DRILLING APPARATUS COMPRISING IN COMBINATION: A TUBULAR SUPPORT MEMBER, A PLURALITY OF CIRCUMFERENTIALLY ARRANGED SHROUD SEGMENTS HELD BY SAID SUPPORT MEMBER IN FLEXIBLE RELATION THERETO AND EXTENDING BELOW SAID SUPPORT MEMBER IN A MANNER DEFINING AN OPEN-BOTTOM SHROUD ADAPTED TO MAINTAIN A PLURALITY OF PELLETS IN CAPTIVE CIRCULATION THEREWITHIN, A FIRST NOZZLE ELEMENT SUPPORTED BY SAID TUBULAR MEMBER ADJACENT THE LOWER TERMINATION THEREOF AND ADAPTED TO EJECT THEREFROM A HIGH VELOCITY STREAM OF FLUID, A SECOND NOZZLE ELEMENT SUPPORTED BELOW SAID FIRST NOZZLE ELEMENT IN SPACED CONCENTRIC RELATION THEREWITH, SAID SECOND NOZZLE ELEMENT BEING SPACED FROM SAID SHROUD ELEMENTS AND FROM SAID FIRST NOZZLE ELEMENT TO PROVIDE FOR UPWARD PASSAGE OF PELLETS BETWEEN SAID SECOND NOZZLE ELEMENT AND SAID SHROUD AND FOR ENTRY OF PELLETS INTO THE TOP OF SAID SECOND NOZZLE, MEANS BIASING SAID
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) | 1959-02-20 | 1959-08-22 | 1960-02-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-02-20 | 1963-08-22 | 1964-02-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-02-20 | 1967-08-22 | 1968-02-21 | $7700.00 | Window Closed / Lapsed |