Patent US3448435A successfully refreshed from Google Patents.
US3448435A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic reed switching matrix
Assignee: AT&T Inc
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Filing: 1966-06-17
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Granted: 1969-06-03
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Expires: 1986-06-17
Abstract
No abstract record available.
Inventors
- 👤 Roger A Billhardt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 20:45
CPC Classifications
H; H01; H01H; H01H67/00; H01H67/22; H01H67/24
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
105 words
AN ELECTRICAL SWITCH CIRCUIT COMPRISING A PLURALITY OF MAGNETICALLY RESPONSIVE SWITCH DEVICES ARRANGED IN ROWS AND COLUMNS, EACH OF SAID SWITCH DEVICES HAVING A FIRST WINDING AND AN OPPOSITELY POLED, SECOND WINDING THEREON, A PLURALITY OF ROW CONDUCTORS, EACH INCLUDINGG THE FIRST WINDINGS OF THE SWITCH DEVICES OF A ROW, A PLURALITY OF COLUMN CONDUCTORS EACH INCLUDING THE SECOND WINDINGS OF THE SWITCH DEVICES OF A COLUMN, AND MEANS FOR SELECTIVELY APPLYING FIRST AND SECOND DECAYING ALTERNATING CURRENTS OF SUBSTANTIALLY EQUAL FREQUENCY AND AMPLITUDE TO SAID ROW AND COLUMN CONDUCTORS, RESPECTIVELY, ONE OF SAID FIRST AND SECOND CURRENTS BEING APPLIED ONE-HALF CYCLE BEFORE THE OTHER.
Claim 2
Dependent Claim
105 words
AN ELECTRICAL SWITCH CIRCUIT COMPRISING A PLURALITY OF MAGNETICALLY RESPONSIVE SWITCH DEVICES ARRANGED IN ROWS AND COLUMNS, EACH OF SAID SWITCH DEVICES HAVING A FIRST WINDING AND AN OPPOSITELY POLED, SECOND WINDING THEREON, A PLURALITY OF ROW CONDUCTORS, EACH INCLUDINGG THE FIRST WINDINGS OF THE SWITCH DEVICES OF A ROW, A PLURALITY OF COLUMN CONDUCTORS EACH INCLUDING THE SECOND WINDINGS OF THE SWITCH DEVICES OF A COLUMN, AND MEANS FOR SELECTIVELY APPLYING FIRST AND SECOND DECAYING ALTERNATING CURRENTS OF SUBSTANTIALLY EQUAL FREQUENCY AND AMPLITUDE TO SAID ROW AND COLUMN CONDUCTORS, RESPECTIVELY, ONE OF SAID FIRST AND SECOND CURRENTS BEING APPLIED ONE-HALF CYCLE BEFORE THE OTHER.
References Cited (Backward Citations)
US3037085A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-06-02 | 1972-12-02 | 1973-06-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-06-02 | 1976-12-02 | 1977-06-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-06-02 | 1980-12-02 | 1981-06-03 | $7700.00 | Window Closed / Lapsed |