US3668408A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Light sensor matrix device consisting of photo-conductive elements
Assignee: Panasonic Holdings Corp
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Filing: 1971-03-15
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Granted: 1972-06-06
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Expires: 1991-03-15
Abstract
Abstract A light sensor matrix device for the static reading of punched cards and for the pattern recognition. It has groups of sandwichtype CdS photo-conductive elements arranged two-dimensionally on a printed circuit board at positions corresponding to those of holes of the punched card. The photo-conductive elements are connected in series with respective associated diodes, and the individual series circuits are connected in matrix form.
Inventors
- 👤 Oshio Yamashita
- 👤 Manabu Yoshisa
- 👤 Nobuo Hasegawa
- 👤 Saburo Kitamura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 19:09
CPC Classifications
G; G06; G06K; G06K7/00; G06K7/10; G06K7/10544; G06K7/10821; G06K7/10841; H; H04; H04N; H04N25/00; H04N25/70; H04N25/76
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-06-06 | 1975-12-06 | 1976-06-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-06 | 1979-12-06 | 1980-06-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-06 | 1983-12-06 | 1984-06-06 | $7700.00 | Window Closed / Lapsed |