Patent US3250257A successfully refreshed from Google Patents.
US3250257A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rolling type pencil sharpener
Assignee: Individual
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Filing: 1964-12-21
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Granted: 1966-05-10
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Expires: 1984-12-21
Abstract
No abstract record available.
Inventors
- 👤 Harry A Warner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 13:21
CPC Classifications
B; B43; B43L; B43L23/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
95 words
A ROLLABLE TYPE PENCIL SHARPENER THAT COMPRISES A MOLDED FRUSTO-CONICAL BODY FORMED OF YIELDABLE MATERIAL AND WITH THE BODY HAVING FLAT ENDS, THE BODY BEING AXIALLY RECESSED FROM END TO END, A CUTTER ELEMENT HAVING ELEMENT INTO THE RECESS THE CUTTER ELEMENT BEING STAMPED TO FORM CONCENTRIC GRINDING FACES AND CONCENTRIC WING PORTIONS AND THEREBY THE WINGED PORTIONS FORM STAMPED APART GROOVES FOR COLLECTING MATERIAL THAT IS CUT FROM THE PENCIL, THE GRINDING FACES HAVING CUTTING MATERIAL FIXED THERETO FOR THEIR FULL LENGTH, THE CUTTING ELEMENT AND THE GRINDING FACES AND THE WINGS BEING FRUSTO-CONICAL.
Claim 2
Dependent Claim
95 words
A ROLLABLE TYPE PENCIL SHARPENER THAT COMPRISES A MOLDED FRUSTO-CONICAL BODY FORMED OF YIELDABLE MATERIAL AND WITH THE BODY HAVING FLAT ENDS, THE BODY BEING AXIALLY RECESSED FROM END TO END, A CUTTER ELEMENT HAVING ELEMENT INTO THE RECESS THE CUTTER ELEMENT BEING STAMPED TO FORM CONCENTRIC GRINDING FACES AND CONCENTRIC WING PORTIONS AND THEREBY THE WINGED PORTIONS FORM STAMPED APART GROOVES FOR COLLECTING MATERIAL THAT IS CUT FROM THE PENCIL, THE GRINDING FACES HAVING CUTTING MATERIAL FIXED THERETO FOR THEIR FULL LENGTH, THE CUTTING ELEMENT AND THE GRINDING FACES AND THE WINGS BEING FRUSTO-CONICAL.
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) | 1969-05-09 | 1969-11-08 | 1970-05-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-05-09 | 1973-11-08 | 1974-05-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-05-09 | 1977-11-08 | 1978-05-10 | $7700.00 | Window Closed / Lapsed |