US3516176A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Touch detecting teaching machine
Assignee: Behavioural Research & Dev Ltd
•
Filing: 1967-12-26
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Granted: 1970-06-23
•
Expires: 1987-12-26
Abstract
No abstract record available.
Inventors
- 👤 Alan Cleary
- 👤 Derek W Packham
- 👤 Jack C Pashley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 21:14
CPC Classifications
G; G09; G09B; G09B7/00; G09B7/06
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USRE23030E
Cited
US3382588A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-06-22 | 1973-12-22 | 1974-06-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-06-22 | 1977-12-22 | 1978-06-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-06-22 | 1981-12-22 | 1982-06-23 | $7700.00 | Window Closed / Lapsed |