Patent US3561881A successfully refreshed from Google Patents.
US3561881A
Expired / Lapsed
US
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Stylographic pen with the capillary passage cleaning means operable by hand or by shaking or contact
Assignee: Individual
•
Filing: 1969-05-07
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Granted: 1971-02-09
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Expires: 1989-05-07
Abstract
Abstract A STYLOGRAPHIC WRITING PEN HAVING A LONGITUDINALLY DISPLACEABLE WIRE IN THE CAPILLARY PASSAGE OF ITS PEN STYLUS WHEREBY IN REST POSITION THIS WIRE PROTRUDES THROUGH THE PEN TIP BOTTOM EITHER BY HAND OR BY LONGITUDINALLY SHAKING OF THE PEN OR BY RESTING OF THE PIN TIP ON THE WRITING SURFACE, THE WIRE CAN BE MOVED OR LESS REACTED INTO THE INK PASSAGEWAY.
Inventors
- 👤 Edward Bok
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 16:04
CPC Classifications
B; B43; B43K; B43K8/00; B43K8/16
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-02-08 | 1974-08-10 | 1975-02-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-08 | 1978-08-10 | 1979-02-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-08 | 1982-08-10 | 1983-02-09 | $7700.00 | Window Closed / Lapsed |