Patent US3280927A successfully refreshed from Google Patents.
US3280927A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Finger-type pilot bit
Assignee: Individual
•
Filing: 1964-01-31
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Granted: 1966-10-25
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Expires: 1984-01-31
Abstract
No abstract record available.
Inventors
- 👤 Gerald A Petersen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 16:52
CPC Classifications
E; E21; E21B; E21B10/00; E21B10/62; E21B10/627; E21B10/633
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
153 words
A ROTARY BIT COMPRISING A BODY FORMED WITH A PLURALITY OF SOCKETS, A TOOTH IN EACH SAID SOCKET COMPLEMENTARY TO SAID SOCKET, AND MEANS FOR REMOVABLY HOLDING EACH SAID TOOTH IN ITS RESPECTIVE SOCKET, EACH SAID TOOTH COMPRISING A SHORT SECTION OF PRISMATIC HARD MATERIAL BAR STOCK OF RHOMBOID SHAPE IN CROSS-SECTION PARTIALLY PROJECTING FROM SAID BODY, AT LEAST THE EXPOSED END OF SAID TOOTH BEING PERPENDICULAR TO THE SIDES OF SAID TOOTH, SAID SOCKETS FORMED SO THAT ONE SIDE EDGE OF THE EXPOSED END OF EACH SAID TOOTH IS THE CUTTING EDGE IN THE DIRECTION OF ROTATION OF SAID BIT, SAID CUTTING EDGE IN BEING LOWERMOST IN ELEVATION WHEN SAID BIT IS IN POSITION FOR VERTICAL DRILLING AND SAID CUTTING EDGE VIEWED IN BOTTOM PLAN BEING DISPOSED AT AN ACUTE ANGLE TO A RADIUS FROM THE AXIS OF ROTATION TO THE OUTERMOST CORNER OF SAID CUTTING EDGE, SAID CUTTING EDGE SLANTING REARWARDLY-INWARDLY.
Claim 2
Dependent Claim
153 words
A ROTARY BIT COMPRISING A BODY FORMED WITH A PLURALITY OF SOCKETS, A TOOTH IN EACH SAID SOCKET COMPLEMENTARY TO SAID SOCKET, AND MEANS FOR REMOVABLY HOLDING EACH SAID TOOTH IN ITS RESPECTIVE SOCKET, EACH SAID TOOTH COMPRISING A SHORT SECTION OF PRISMATIC HARD MATERIAL BAR STOCK OF RHOMBOID SHAPE IN CROSS-SECTION PARTIALLY PROJECTING FROM SAID BODY, AT LEAST THE EXPOSED END OF SAID TOOTH BEING PERPENDICULAR TO THE SIDES OF SAID TOOTH, SAID SOCKETS FORMED SO THAT ONE SIDE EDGE OF THE EXPOSED END OF EACH SAID TOOTH IS THE CUTTING EDGE IN THE DIRECTION OF ROTATION OF SAID BIT, SAID CUTTING EDGE IN BEING LOWERMOST IN ELEVATION WHEN SAID BIT IS IN POSITION FOR VERTICAL DRILLING AND SAID CUTTING EDGE VIEWED IN BOTTOM PLAN BEING DISPOSED AT AN ACUTE ANGLE TO A RADIUS FROM THE AXIS OF ROTATION TO THE OUTERMOST CORNER OF SAID CUTTING EDGE, SAID CUTTING EDGE SLANTING REARWARDLY-INWARDLY.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-10-24 | 1970-04-25 | 1970-10-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-10-24 | 1974-04-25 | 1974-10-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-10-24 | 1978-04-25 | 1978-10-25 | $7700.00 | Window Closed / Lapsed |