US3114841A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photo electric card reading system
Assignee: Unisys Corp
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Filing: 1961-06-02
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Granted: 1963-12-17
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Expires: 1981-06-02
Abstract
No abstract record available.
Inventors
- 👤 Eugene E Paananen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 18:22
CPC Classifications
G; G06; G06K; G06K7/00; G06K7/01; G06K7/016
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
144 words
IN A PHOTO ELECTRIC CARD READING SYSTEM, MEANS FOR DERIVING SIGNALS REPRESENTATIVE OF THE ADVANCEMENT OF THE CARD COMPRISING TWO EQUAL GROUPS OF ALTERNATELY ARRANGED PHOTO DIODES, EACH OF SAID PHOTO DIODES BEING OF APPROXIMATELY EQUAL LIGHT SENSITIVITY, A PAIR OF INPUT INDUCTANCES EACH COUPLED TO A DIFFERNT ONE OF SAID GROUPS OF PHOTO DIODES AND CONNECTABLE TO A SOURCE OF D.C. POTENTIAL, SAID INPUT INDUCTANCES BEING MAGNETICALLY COUPLED IN A BALANCED FLUX SUBTRACTIVE CONDITION AND SERIALLY CONNECTED AT A COMMON POINT, A SOURCE OF SUBSTANTIALLY CONSTANT ILLUMINATION DIRECTED AT BOTH OF SAID GROUPS OF PHOTO DIODES MEANS FOR ADVANCING THE CARD WHEREBY ITS LEADING EDGE ALTERNATELY MASKS PHOTO DIODES IN SAID TWO GROUPS TO EFFECT AN UNBALANCED FLUX CONDITION IN SAID INPUT INDUCTANCES AND MEANS FOR DERIVING AN OUTPUT SIGNAL FROM EITHER OF SAID INPUT INDUCTANCES RESPONSIVE TO A FLUX UNBALANCE CONDITION THEREIN.
Claim 2
Dependent Claim
144 words
IN A PHOTO ELECTRIC CARD READING SYSTEM, MEANS FOR DERIVING SIGNALS REPRESENTATIVE OF THE ADVANCEMENT OF THE CARD COMPRISING TWO EQUAL GROUPS OF ALTERNATELY ARRANGED PHOTO DIODES, EACH OF SAID PHOTO DIODES BEING OF APPROXIMATELY EQUAL LIGHT SENSITIVITY, A PAIR OF INPUT INDUCTANCES EACH COUPLED TO A DIFFERNT ONE OF SAID GROUPS OF PHOTO DIODES AND CONNECTABLE TO A SOURCE OF D.C. POTENTIAL, SAID INPUT INDUCTANCES BEING MAGNETICALLY COUPLED IN A BALANCED FLUX SUBTRACTIVE CONDITION AND SERIALLY CONNECTED AT A COMMON POINT, A SOURCE OF SUBSTANTIALLY CONSTANT ILLUMINATION DIRECTED AT BOTH OF SAID GROUPS OF PHOTO DIODES MEANS FOR ADVANCING THE CARD WHEREBY ITS LEADING EDGE ALTERNATELY MASKS PHOTO DIODES IN SAID TWO GROUPS TO EFFECT AN UNBALANCED FLUX CONDITION IN SAID INPUT INDUCTANCES AND MEANS FOR DERIVING AN OUTPUT SIGNAL FROM EITHER OF SAID INPUT INDUCTANCES RESPONSIVE TO A FLUX UNBALANCE CONDITION THEREIN.
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) | 1966-12-16 | 1967-06-17 | 1967-12-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-12-16 | 1971-06-17 | 1971-12-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-12-16 | 1975-06-17 | 1975-12-17 | $7700.00 | Window Closed / Lapsed |