Patent US3443109A successfully refreshed from Google Patents.
US3443109A
Expired / Lapsed
US
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Electro-optical reading device utilizing a pulsed semiconductor diode lamp
Assignee: National Research Development Corp UK
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Filing: 1963-12-10
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Granted: 1969-05-06
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Expires: 1983-12-10
Abstract
No abstract record available.
Inventors
- 👤 Ronald Francis Johnston Broom
- 👤 Cyril Hilsum
- 👤 Donald Bayley
- 👤 John Dennis Ralphs
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 04:34
CPC Classifications
G; G06; G06K; G06K7/00; G06K7/10; G06K7/10544; G06K7/10821; G06K7/10851
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3111587A
Cited
US2872589A
Cited
US3020534A
Cited
US3036765A
Cited
US3065356A
Cited
US3124675A
Cited
US3293513A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-05-05 | 1972-11-04 | 1973-05-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-05-05 | 1976-11-04 | 1977-05-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-05-05 | 1980-11-04 | 1981-05-06 | $7700.00 | Window Closed / Lapsed |