Patent US3285351A successfully refreshed from Google Patents.
US3285351A
Expired / Lapsed
US
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Drilling apparatus
Assignee: Individual
•
Filing: 1965-07-09
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Granted: 1966-11-15
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Expires: 1985-07-09
Abstract
No abstract record available.
Inventors
- 👤 Michael R Caro
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 13:14
CPC Classifications
E; E21; E21B; E21B11/00; E21B11/06; E21B10/00; E21B10/26; E21B10/32; E21B10/34
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
101 words
DRILLING APPARATUS OF THE CHARACTERS DESCRIBED COMPRISING, IN COMBINATION, A MAIN SHAFT ADAPTED FOR POWERED ROTATION, A HOUSING ROTATABLY MOUNTED AXIALLY ABOUT SAID SHAFT, GEARING CONNECTING SAID HOUSING TO SAID SHAFT FOR ROTATION OF SAID HOUSING BY SAID SHAFT IN A DIRECTION OPPOSITELY OF THE DIRECTION OF ROTATION OF SAID SHAFT, A DRIVE SPROCKET MOUNTED ON SAID HOUSING AND CONNECTED TO SAID SHAFT FOR ROTATION RELATIVE TO SAID HOUSING ABOUT AN AXIS GENERALLY NORMAL TO SAID SHAFT, AN IDLING SPROCKET MOUNTED ON SAID HOUSING FOR ROTATION RELATIVE TO SAID HOUSING ABOUT AN AXIS GENERALLY NORMAL TO SAID SHAFT, A CUTTING CHAIN
Claim 2
Dependent Claim
101 words
DRILLING APPARATUS OF THE CHARACTERS DESCRIBED COMPRISING, IN COMBINATION, A MAIN SHAFT ADAPTED FOR POWERED ROTATION, A HOUSING ROTATABLY MOUNTED AXIALLY ABOUT SAID SHAFT, GEARING CONNECTING SAID HOUSING TO SAID SHAFT FOR ROTATION OF SAID HOUSING BY SAID SHAFT IN A DIRECTION OPPOSITELY OF THE DIRECTION OF ROTATION OF SAID SHAFT, A DRIVE SPROCKET MOUNTED ON SAID HOUSING AND CONNECTED TO SAID SHAFT FOR ROTATION RELATIVE TO SAID HOUSING ABOUT AN AXIS GENERALLY NORMAL TO SAID SHAFT, AN IDLING SPROCKET MOUNTED ON SAID HOUSING FOR ROTATION RELATIVE TO SAID HOUSING ABOUT AN AXIS GENERALLY NORMAL TO SAID SHAFT, A CUTTING CHAIN
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) | 1969-11-14 | 1970-05-16 | 1970-11-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-11-14 | 1974-05-16 | 1974-11-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-11-14 | 1978-05-16 | 1978-11-15 | $7700.00 | Window Closed / Lapsed |