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US2981009A
Expired / Lapsed
US
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Educational building block set
Assignee: Individual
•
Filing: 1959-06-12
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Granted: 1961-04-25
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Expires: 1979-06-12
Abstract
No abstract record available.
Inventors
- 👤 Lindquist Nora
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 13:01
CPC Classifications
G; G09; G09B; G09B1/00; G09B1/32; G09B1/36; G09B23/00; G09B23/28; G09B23/30; G09B23/34
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
DE605262C
Cited
CA473978A
Cited
US983547A
Cited
US979147A
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US1895611A
Cited
US2108229A
Cited
US2107691A
Cited
GB630302A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-04-24 | 1964-10-24 | 1965-04-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-04-24 | 1968-10-24 | 1969-04-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-04-24 | 1972-10-24 | 1973-04-25 | $7700.00 | Window Closed / Lapsed |