US2837839A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vocabulary study device
Assignee: Individual
•
Filing: 1954-10-19
•
Granted: 1958-06-10
•
Expires: 1974-10-19
Abstract
No abstract record available.
Inventors
- 👤 Linders J Fernbach
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 01:36
CPC Classifications
G; G09; G09B; G09B19/00; G09B19/06; G09B19/08
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US157690A
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US420554A
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US614383A
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US770841A
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US838840A
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US1235073A
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US1918298A
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US2360255A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-06-09 | 1961-12-09 | 1962-06-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-06-09 | 1965-12-09 | 1966-06-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-06-09 | 1969-12-09 | 1970-06-10 | $7700.00 | Window Closed / Lapsed |