US3112802A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Earth boring under-reaming tool
Assignee: Economic Foundations Ltd
•
Filing: 1960-06-01
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Granted: 1963-12-03
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Expires: 1980-06-01
Abstract
No abstract record available.
Inventors
- 👤 Amann Gustav Wolfgang
- 👤 Woolgar Reginald John
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 09:11
CPC Classifications
E; E21; E21B; E21B10/00; E21B10/26; E21B10/32
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
105 words
IN AN EARTH-BORING UNDER-REAMING TOOL, HAVING A CYLINDRICAL HOLLOW BASE FOR RECEIVING SPOIL, A SUPERSTRUCTURE INCLUDING AN UPSTANDING SUPPORT MEMBER MOUNTED ON SAID BASE AND AN ACTUATING MEMBER ROTATABLE WITH AND SLIDABLE LONGITUDINALLY OF SAID SUPPORT MEMBER, A PLURALITY OF BLADES SYMMETRICALLY DISPOSED ABOUT AND PIVOTALLY SUPPORTED AT ONE END THEREOF TO SAID SUPERSTRUCTURE AND LINKS FOR EACH BLADE PIVOTALLY CONNECTED TO A RESPECTIVE BLADE AND TO SAID SUPERSTRUCTURE, THE IMPROVEMENT WHICH COMPRISES MEANS MOUNTING THE SUPPORT MEMBER ROTATABLY ON THE BASE WHEREBY SAID SUPERSTRUCTURE CAN ROTATE RELATIVE TO SAID BASE WHEN THE BASE IS STATIONARY AT THE BOTTOM OF A HOLE TO BE UNDER-REAMED.
Claim 2
Dependent Claim
105 words
IN AN EARTH-BORING UNDER-REAMING TOOL, HAVING A CYLINDRICAL HOLLOW BASE FOR RECEIVING SPOIL, A SUPERSTRUCTURE INCLUDING AN UPSTANDING SUPPORT MEMBER MOUNTED ON SAID BASE AND AN ACTUATING MEMBER ROTATABLE WITH AND SLIDABLE LONGITUDINALLY OF SAID SUPPORT MEMBER, A PLURALITY OF BLADES SYMMETRICALLY DISPOSED ABOUT AND PIVOTALLY SUPPORTED AT ONE END THEREOF TO SAID SUPERSTRUCTURE AND LINKS FOR EACH BLADE PIVOTALLY CONNECTED TO A RESPECTIVE BLADE AND TO SAID SUPERSTRUCTURE, THE IMPROVEMENT WHICH COMPRISES MEANS MOUNTING THE SUPPORT MEMBER ROTATABLY ON THE BASE WHEREBY SAID SUPERSTRUCTURE CAN ROTATE RELATIVE TO SAID BASE WHEN THE BASE IS STATIONARY AT THE BOTTOM OF A HOLE TO BE UNDER-REAMED.
References Cited (Backward Citations)
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US1787001A
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US2031353A
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US2203246A
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US2719698A
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US2910274A
Cited
GB835919A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1966-12-02 | 1967-06-03 | 1967-12-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-12-02 | 1971-06-03 | 1971-12-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-12-02 | 1975-06-03 | 1975-12-03 | $7700.00 | Window Closed / Lapsed |