US3521236A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electro-optical apparatus for recognizing printed or written characters
Assignee: National Research Development Corp UK
•
Filing: 1965-04-12
•
Granted: 1970-07-21
•
Expires: 1985-04-12
Abstract
No abstract record available.
Inventors
- 👤 John R Parks
- 👤 Charles H Davis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 03:09
CPC Classifications
G; G06; G06V; G06V10/00; G06V10/10; G06V10/20; G06V30/00; G06V30/10; G06V30/18; G06V30/184; G06V30/186; G06V30/187; G06V30/19; G06V30/192
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3011152A
Cited
US3092809A
Cited
US3158840A
Cited
US3339179A
Cited
US3196399A
Cited
US3308430A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-07-20 | 1974-01-19 | 1974-07-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-07-20 | 1978-01-19 | 1978-07-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-07-20 | 1982-01-19 | 1982-07-21 | $7700.00 | Window Closed / Lapsed |