US2824389A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Education device
Assignee: Individual
•
Filing: 1955-12-29
•
Granted: 1958-02-25
•
Expires: 1975-12-29
Abstract
No abstract record available.
Inventors
- 👤 Nelle R Orebaugh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 13:20
CPC Classifications
G; G09; G09B; G09B17/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US140722A
Cited
DE393900C
Cited
US969309A
Cited
US1019545A
Cited
US1224742A
Cited
US1326695A
Cited
GB163929A
Cited
US1445819A
Cited
GB255129A
Cited
US1755853A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-02-24 | 1961-08-26 | 1962-02-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-02-24 | 1965-08-26 | 1966-02-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-02-24 | 1969-08-26 | 1970-02-25 | $7700.00 | Window Closed / Lapsed |