Patent US1774878A successfully refreshed from Google Patents.
Patent US3252083A successfully refreshed from Google Patents.
US3252083A
Expired / Lapsed
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System for monitoring condition changes in a switching device
Assignee: AT&T Inc
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Filing: 1964-07-22
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Granted: 1966-05-17
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Expires: 1984-07-22
Abstract
No abstract record available.
Inventors
- 👤 Harold N Wagar
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 03:55
CPC Classifications
H; H01; H01H; H01H47/00; H01H47/002; H04; H04Q; H04Q1/00; H04Q1/18; H04Q1/20
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
144 words
A MAGNETIC SWITCHING DEVICE COMPRISING: A SOURCE OF MAGNETIC FLUX; SWITCHING MEANS DISPOSED IN THE PATH OF FLUX FROM SAID SOURCE, SAID SWITCHING MEANS COMPRISING A PLURALITY OF CONTACTS ENGAGEABLE WITH EACH OTHER FOR ESTABLISHING AN ELECTRICALLY CONDUCTING PATH IN RESPONSE TO FLUX FROM SAID SOURCE; A CURRENT SOURCE FOR SUPPLYING CURRENT TO SAID CONTACTS; AND MEANS FOR RESPONDING TO A FIRST, SECOND, THIRD, AND FOURTH PULSE INDUCED BY CHANGES IN SAID MAGNETIC FLUX AND INDICATING THE STATE OF OPERATION OF THE SWITCHING DEVICE, SAID FIRST PULSE BEING INDUCED WHEN FLUX FROM SAID SOURCE IS INITIALLY APPLIED TO SAID SWITCHING MEANS, SAID SECOND PULSE BEING INDUCED WHEN CURRENT IS INITIALLY SUPPLIED TO SAID CONTACTS, SAID THIRD PULSE BEING INDUCED WHEN CURRENT SUPPLIED TO SAID CONTACTS IS INTERRUPTED, AND SAID FOURTH PULSE BEING INDUCED WHEN FLUX FROM SAID SOURCE IS REMOVED FROM SAID SWITCHING MEANS.
Claim 2
Dependent Claim
144 words
A MAGNETIC SWITCHING DEVICE COMPRISING: A SOURCE OF MAGNETIC FLUX; SWITCHING MEANS DISPOSED IN THE PATH OF FLUX FROM SAID SOURCE, SAID SWITCHING MEANS COMPRISING A PLURALITY OF CONTACTS ENGAGEABLE WITH EACH OTHER FOR ESTABLISHING AN ELECTRICALLY CONDUCTING PATH IN RESPONSE TO FLUX FROM SAID SOURCE; A CURRENT SOURCE FOR SUPPLYING CURRENT TO SAID CONTACTS; AND MEANS FOR RESPONDING TO A FIRST, SECOND, THIRD, AND FOURTH PULSE INDUCED BY CHANGES IN SAID MAGNETIC FLUX AND INDICATING THE STATE OF OPERATION OF THE SWITCHING DEVICE, SAID FIRST PULSE BEING INDUCED WHEN FLUX FROM SAID SOURCE IS INITIALLY APPLIED TO SAID SWITCHING MEANS, SAID SECOND PULSE BEING INDUCED WHEN CURRENT IS INITIALLY SUPPLIED TO SAID CONTACTS, SAID THIRD PULSE BEING INDUCED WHEN CURRENT SUPPLIED TO SAID CONTACTS IS INTERRUPTED, AND SAID FOURTH PULSE BEING INDUCED WHEN FLUX FROM SAID SOURCE IS REMOVED FROM SAID SWITCHING MEANS.
References Cited (Backward Citations)
US2981810A
Cited
US3146325A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-05-16 | 1969-11-15 | 1970-05-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-05-16 | 1973-11-15 | 1974-05-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-05-16 | 1977-11-15 | 1978-05-17 | $7700.00 | Window Closed / Lapsed |