US2838847A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Spelling device
Assignee: Individual
•
Filing: 1952-06-18
•
Granted: 1958-06-17
•
Expires: 1972-06-18
Abstract
No abstract record available.
Inventors
- 👤 Albert M Zalkind
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 12:06
CPC Classifications
G; G09; G09B; G09B17/00; G09B17/003
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
AT45507B
Cited
US1599156A
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US1932994A
Cited
US2200206A
Cited
GB567578A
Cited
GB602556A
Cited
US2539077A
Cited
US2505230A
Cited
US2591327A
Cited
US2704210A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-06-16 | 1961-12-16 | 1962-06-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-06-16 | 1965-12-16 | 1966-06-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-06-16 | 1969-12-16 | 1970-06-17 | $7700.00 | Window Closed / Lapsed |