Patent US2457217A successfully refreshed from Google Patents.
US2457217A
Expired / Lapsed
US
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Dual fountain pen
Assignee: Individual
•
Filing: 1945-07-13
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Granted: 1948-12-28
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Expires: 1965-07-13
Abstract
No abstract record available.
Inventors
- 👤 Ernst Max
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 16:48
CPC Classifications
B; B43; B43K; B43K27/00; B43K27/08
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US188721A
Cited
US272700A
Cited
DE643545C
Cited
US732543A
Cited
FR563425A
Cited
GB346321A
Cited
GB502381A
Cited
US2166203A
Cited
US2244897A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-12-28 | 1952-06-28 | 1952-12-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-12-28 | 1956-06-28 | 1956-12-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-12-28 | 1960-06-28 | 1960-12-28 | $7700.00 | Window Closed / Lapsed |