Patent US3779652A successfully refreshed from Google Patents.
US3779652A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automatic pencil for drawing a line
Assignee: NISHITETSU SANGYO CO Ltd
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Filing: 1971-08-05
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Granted: 1973-12-18
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Expires: 1991-08-05
Abstract
Abstract An automatic pencil comprises a motor for constantly rotating the lead therein so that its point is automatically sharpened by contact with a writing surface.
Inventors
- 👤 S Kunitoku
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 23:07
CPC Classifications
B; B43; B43K; B43K29/00; B43K29/06; B43K21/00; B43K21/006
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
69 words
An automatic pencil for drawing a line comprising a hollow casing having an open end, gripping means rotatbly mounted in said casing in axial alignment with said open end for holding a lead projecting through said open end against transverse movement within said casing, and an electric motor connected to rotate said gripping means and lead, both said motor and gripping means being longitudinally sladable in said casing. slidable
Claim 2
Dependent Claim
69 words
An automatic pencil for drawing a line comprising a hollow casing having an open end, gripping means rotatbly mounted in said casing in axial alignment with said open end for holding a lead projecting through said open end against transverse movement within said casing, and an electric motor connected to rotate said gripping means and lead, both said motor and gripping means being longitudinally sladable in said casing. slidable
Claim 3
Dependent Claim
122 words
An automatic pencil for drawing a line comprising a hollow casing having an open end, gripping means rotatably mounted in said casing in axial alignment with said open end for holding a lead projecting through said open end against transverse movement within said casing, and an electric motor connected to rotate said gripping means and lead, said casing comprising two parts, one of which is slidable with respect to the other, and said motor being fixed to one of said parts. 3 An automatic pencil as claimed in claim 2 in which said gripping means is a spring-operated chuck mounted to be opened when one part of said casing slides toward the other and closed when it slides away from the other.
Claim 4
Dependent Claim
128 words
An automatic pencil for drawing a line comprising a hollow casing having an open end, gripping means rotatably mounted in said casing in axial alignment with said open end for holding a lead projecting through said open end against transverse movement within said casing, and an electric motor connected to rotate said gripping means and lead, said motor being mounted to slide in said casing and said gripping means being a spring operated chuck mounted to be opened when said motor slides in one direction from a normal rest position and closed when said motor slides in the other direction and while it remains in said rest position, and said motor carrying abutment means positioned to advance said lead when said motor is moved in said one direction.
Claim 5
Dependent Claim
128 words
An automatic pencil for drawing a line comprising a hollow casing having an open end, gripping means rotatably mounted in said casing in axial alignment with said open end for holding a lead projecting through said open end against transverse movement within said casing, and an electric motor connected to rotate said gripping means and lead, said motor being mounted to slide in said casing and said gripping means being a spring operated chuck mounted to be opened when said motor slides in one direction from a normal rest position and closed when said motor slides in the other direction and while it remains in said rest position, and said motor carrying abutment means positioned to advance said lead when said motor is moved in said one direction.
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) | 1976-12-17 | 1977-06-18 | 1977-12-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-17 | 1981-06-18 | 1981-12-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-17 | 1985-06-18 | 1985-12-18 | $7700.00 | Window Closed / Lapsed |