Patent US3237870A successfully refreshed from Google Patents.
US3134908A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetically controlled switching devices with non-destructive readout
Assignee: AT&T Inc
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Filing: 1959-07-13
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Granted: 1964-05-26
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Expires: 1979-07-13
Abstract
No abstract record available.
Inventors
- 👤 Walter B Ellwood
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 22:17
CPC Classifications
H; H01; H01H; H01H51/00; H01H51/27
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
150 words
IN COMBINATION, A SWITCH HAVING ELECTRICAL CONTACTING MEMBERS OPERABLE BY MAGNETIC FLUX THERETHROUGH, A MAGNETIC MEMBER OF A MATERIAL EXHIBITING A PLURALITY OF STABLE REMANENT MAGNETIZATION STATES AND DEFINING A FIRST CLOSED FLUX LOOP, MEANS FOR COMPLETING A SECOND CLOSED FLUX LOOP THROUGH SAID CONTACTING MEMBERS AND SAID MAGNETIC MEMBER, MEANS FOR PRODUCING MAGNETIC FLUX THROUGH SAID CONTACTING MEMBERS INCLUDING FIRST ENERGIZING MEANS FOR ESTABLISHING A PARTICULAR MAGNETIZATION STATE IN SAID MAGNETIC MEMBER IN SAID SECOND FLUX LOOP, MEANS FOR ELIMINATING SAID MAGNETIC FLUX THROUGH SAID CONTACTING MEMBERS INCLUDING SECOND ENERGIZING MEANS FOR ESTABLISHING A DIFFERENT MAGNETIZATION STATE IN SAID MAGNETIC MEMBER IN SAID FIRST FLUX LOOP, AND MEANS FOR ASCERTAINING THE MAGNETIZATION STATE OF SAID MAGNETIC MEMBER WITHOUT CHANGING SAID STATE INCLUDING CURRENT CONDUCTIVE MEANS INDUCTIVELY COUPLED TO SAID MAGNETIC MEMBER AND SAID SECOND CLOSED FLUX LOOP, AND DETECTING WINDING MEANS INDUCTIVELY COUPLED TO SAID SECOND CLOSED FLUX LOOP.
Claim 2
Dependent Claim
150 words
IN COMBINATION, A SWITCH HAVING ELECTRICAL CONTACTING MEMBERS OPERABLE BY MAGNETIC FLUX THERETHROUGH, A MAGNETIC MEMBER OF A MATERIAL EXHIBITING A PLURALITY OF STABLE REMANENT MAGNETIZATION STATES AND DEFINING A FIRST CLOSED FLUX LOOP, MEANS FOR COMPLETING A SECOND CLOSED FLUX LOOP THROUGH SAID CONTACTING MEMBERS AND SAID MAGNETIC MEMBER, MEANS FOR PRODUCING MAGNETIC FLUX THROUGH SAID CONTACTING MEMBERS INCLUDING FIRST ENERGIZING MEANS FOR ESTABLISHING A PARTICULAR MAGNETIZATION STATE IN SAID MAGNETIC MEMBER IN SAID SECOND FLUX LOOP, MEANS FOR ELIMINATING SAID MAGNETIC FLUX THROUGH SAID CONTACTING MEMBERS INCLUDING SECOND ENERGIZING MEANS FOR ESTABLISHING A DIFFERENT MAGNETIZATION STATE IN SAID MAGNETIC MEMBER IN SAID FIRST FLUX LOOP, AND MEANS FOR ASCERTAINING THE MAGNETIZATION STATE OF SAID MAGNETIC MEMBER WITHOUT CHANGING SAID STATE INCLUDING CURRENT CONDUCTIVE MEANS INDUCTIVELY COUPLED TO SAID MAGNETIC MEMBER AND SAID SECOND CLOSED FLUX LOOP, AND DETECTING WINDING MEANS INDUCTIVELY COUPLED TO SAID SECOND CLOSED FLUX LOOP.
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) | 1967-05-26 | 1967-11-25 | 1968-05-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-05-26 | 1971-11-25 | 1972-05-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-05-26 | 1975-11-25 | 1976-05-26 | $7700.00 | Window Closed / Lapsed |