Patent US3405747A successfully refreshed from Google Patents.
US3405747A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pencil lead sharpener
Assignee: Individual
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Filing: 1966-04-25
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Granted: 1968-10-15
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Expires: 1986-04-25
Abstract
No abstract record available.
Inventors
- 👤 Carroll R Dennison
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 13:30
CPC Classifications
B; B43; B43L; B43L23/00; B43L23/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
124 words
IN A PENCIL LEAD SHARPENING DEVICE A HOLLOW HOUSING HAVING AN OPENING AT ONE END A PLUG ROTATABLY MOUNTED IN SAID OPENING AND HAVING A PASSAGEWAY THROUGH WHICH A PENCIL LEAD MAY BE INSERTED ENDWISE, A PLURALITY OF BLADES PIVOTALLY MOUNTED IN THE HOUSING FOR RADIAL MOVEMENT THEREIN A PLANES PARALLEL TO THE AXIS OF SAID OPENING AND HAVING LONGITUDINALLY EXTENDING CUTTING EDGES CONVERGING TOWARD A POINT ON SAID AXIS, BLADE POSITIONING MEANS MOVABLY DISPOSED IN THE HOUSING FOR LONGITUDINAL MOVEMENT THEREIN AND THREAD MEANS OPERATIVELY CONNECTING SAID PLUG AND SAID BLADE POSITIONING MEANS WHEREBY ROTATION OF SAID PLUG IN ON DIRECTION IMPARTS LONGITUDINAL MOVEMENT TO SAID POSITIONING MEANS IN ONE DIRECTION TO VARY THE ANGLE OF SAID CUTTING EDGES RELATIVE TO SAID AXIS.
Claim 2
Dependent Claim
124 words
IN A PENCIL LEAD SHARPENING DEVICE A HOLLOW HOUSING HAVING AN OPENING AT ONE END A PLUG ROTATABLY MOUNTED IN SAID OPENING AND HAVING A PASSAGEWAY THROUGH WHICH A PENCIL LEAD MAY BE INSERTED ENDWISE, A PLURALITY OF BLADES PIVOTALLY MOUNTED IN THE HOUSING FOR RADIAL MOVEMENT THEREIN A PLANES PARALLEL TO THE AXIS OF SAID OPENING AND HAVING LONGITUDINALLY EXTENDING CUTTING EDGES CONVERGING TOWARD A POINT ON SAID AXIS, BLADE POSITIONING MEANS MOVABLY DISPOSED IN THE HOUSING FOR LONGITUDINAL MOVEMENT THEREIN AND THREAD MEANS OPERATIVELY CONNECTING SAID PLUG AND SAID BLADE POSITIONING MEANS WHEREBY ROTATION OF SAID PLUG IN ON DIRECTION IMPARTS LONGITUDINAL MOVEMENT TO SAID POSITIONING MEANS IN ONE DIRECTION TO VARY THE ANGLE OF SAID CUTTING EDGES RELATIVE TO SAID AXIS.
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) | 1971-10-15 | 1972-04-15 | 1972-10-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-10-15 | 1976-04-15 | 1976-10-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-10-15 | 1980-04-15 | 1980-10-15 | $7700.00 | Window Closed / Lapsed |