Patent US3522908A successfully refreshed from Google Patents.
Patent US2500833A successfully refreshed from Google Patents.
US2500833A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fountain pen
Assignee: Esterbrook Pen Co
•
Filing: 1944-10-20
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Granted: 1950-03-14
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Expires: 1964-10-20
Abstract
No abstract record available.
Inventors
- 👤 Henry C Klagges
- 👤 Harry C Kofke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:11
CPC Classifications
B; B43; B43K; B43K5/00; B43K5/02; B43K5/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US335033A
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US605259A
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US1317817A
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US1398779A
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US1469921A
Cited
US1818216A
Cited
US1902809A
Cited
US1980508A
Cited
US1904358A
Cited
US1985643A
Cited
US2093701A
Cited
US2108552A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-03-13 | 1953-09-12 | 1954-03-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-03-13 | 1957-09-12 | 1958-03-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-03-13 | 1961-09-12 | 1962-03-14 | $7700.00 | Window Closed / Lapsed |