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US3424535A
Expired / Lapsed
US
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Self-feeding pencil
Assignee: KONSTANTIN F SCHISCHKOW
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Filing: 1966-10-18
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Granted: 1969-01-28
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Expires: 1986-10-18
Abstract
No abstract record available.
Inventors
- 👤 Konstantin F Schischkow
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 17:14
CPC Classifications
B; B43; B43K; B43K21/00; B43K21/02; B43K21/027
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1430204A
Cited
US1745658A
Cited
US1663742A
Cited
US2353177A
Cited
US2646775A
Cited
US2865330A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-01-28 | 1972-07-29 | 1973-01-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-01-28 | 1976-07-29 | 1977-01-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-01-28 | 1980-07-29 | 1981-01-28 | $7700.00 | Window Closed / Lapsed |