US2514636A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Visual arithmetic teaching apparatus
Assignee: Individual
•
Filing: 1948-12-09
•
Granted: 1950-07-11
•
Expires: 1968-12-09
Abstract
No abstract record available.
Inventors
- 👤 Raymond A Glaze
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 15:29
CPC Classifications
G; G09; G09B; G09B19/00; G09B19/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
DE265451C
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FR321251A
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US183335A
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US805365A
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US1151279A
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US1471437A
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US1560994A
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US1594376A
Cited
US1573358A
Cited
US1950072A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-07-10 | 1954-01-09 | 1954-07-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-07-10 | 1958-01-09 | 1958-07-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-07-10 | 1962-01-09 | 1962-07-11 | $7700.00 | Window Closed / Lapsed |