Patent US2579887A successfully refreshed from Google Patents.
US2579887A
Expired / Lapsed
US
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Selective writing instrument
Assignee: Individual
•
Filing: 1947-03-19
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Granted: 1951-12-25
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Expires: 1967-03-19
Abstract
No abstract record available.
Inventors
- 👤 John A Vierling
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 08:08
CPC Classifications
B; B43; B43K; B43K24/00; B43K24/10; B43K24/14
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US940247A
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US1731683A
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US1786434A
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US1685374A
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US1903800A
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US2071510A
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US2264463A
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US2369080A
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US2427068A
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US2432061A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-12-24 | 1955-06-25 | 1955-12-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-12-24 | 1959-06-25 | 1959-12-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-12-24 | 1963-06-25 | 1963-12-25 | $7700.00 | Window Closed / Lapsed |