Patent US2431015A successfully refreshed from Google Patents.
US2431015A
Expired / Lapsed
US
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Ink reservoir pen
Assignee: Mentmore Manufacturing Co Ltd
•
Filing: 1944-10-03
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Granted: 1947-11-18
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Expires: 1964-10-03
Abstract
No abstract record available.
Inventors
- 👤 Andrews Arthur Edward
- 👤 Johnson William Frederick
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 06:48
CPC Classifications
B; B43; B43K; B43K7/00; B43K7/10; B43K1/00; B43K1/06; B43K5/00; B43K5/18
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US773847A
Cited
US1493680A
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US2103882A
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US2149557A
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US2223541A
Cited
US2241865A
Cited
US2234812A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-11-17 | 1951-05-19 | 1951-11-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-11-17 | 1955-05-19 | 1955-11-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-11-17 | 1959-05-19 | 1959-11-18 | $7700.00 | Window Closed / Lapsed |