US3477143A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrical teaching system
Assignee: ROBERT E AUMANN
•
Filing: 1967-12-06
•
Granted: 1969-11-11
•
Expires: 1987-12-06
Abstract
No abstract record available.
Inventors
- 👤 Robert E Aumann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 12:12
CPC Classifications
G; G09; G09B; G09B7/00; G09B7/06; G09B7/066
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2997793A
Cited
US3122843A
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US3187442A
Cited
US3212199A
Cited
US3141244A
Cited
US3137079A
Cited
US3252230A
Cited
US3389479A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-11-10 | 1973-05-12 | 1973-11-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-11-10 | 1977-05-12 | 1977-11-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-11-10 | 1981-05-12 | 1981-11-11 | $7700.00 | Window Closed / Lapsed |