US3138720A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ferromagnetic sensing device
Assignee: AT&T Inc
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Filing: 1962-07-30
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Granted: 1964-06-23
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Expires: 1982-07-30
Abstract
No abstract record available.
Inventors
- 👤 Robert F Glore
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 15:01
CPC Classifications
H; H04; H04Q; H04Q3/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
124 words
A REPLACEABLE FERROMAGNETIC ASSEMBLY FOR MONITORING THE STATUS OF TELEPHONE LINES AND TRUNKS COMPRISING FIRST AND SECOND FERROMAGNETIC SENSING DEVICES EACH INCLUDING AN ELONGATED COIL SPOOL OF INSULATING MATERIAL HAVING A COAXIAL CHANNEL THEREIN, AN ELONGATED FERROMAGNETIC ELEMENT MOUNTED IN SAID CHANNEL AND HAVING AT LEAST TWO APERTURES, A DRIVE LOOP COUPLED TO SAID FERROMAGNETIC ELEMENT THROUGH SAID TWO APERTURES, A READ LOOP ALSO COUPLED TO SAID FERROMAGNETIC ELEMENT THROUGH SAID TWO APERTURES AND COIL MEANS MOUNTED COAXIALLY ON SAID COIL SPOOL FOR MAGNETICALLY SATURATING SAID FERROMAGNETIC ELEMENT, SAID FIRST AND SECOND FERROMAGNETIC SENSING DEVICES BEING MOUNTED IN TANDEM WITH A SPACE THEREBETWEEN TO SUBSTANTIALLY ELIMINATE MAGNETIC INTERACTION, AND A PAIR OF CONTACT PROTECTION NETWORKS FOR SAID SENSING DEVICES MOUNTED SIDE-BY-SIDE IN SAID SPACE.
Claim 2
Dependent Claim
124 words
A REPLACEABLE FERROMAGNETIC ASSEMBLY FOR MONITORING THE STATUS OF TELEPHONE LINES AND TRUNKS COMPRISING FIRST AND SECOND FERROMAGNETIC SENSING DEVICES EACH INCLUDING AN ELONGATED COIL SPOOL OF INSULATING MATERIAL HAVING A COAXIAL CHANNEL THEREIN, AN ELONGATED FERROMAGNETIC ELEMENT MOUNTED IN SAID CHANNEL AND HAVING AT LEAST TWO APERTURES, A DRIVE LOOP COUPLED TO SAID FERROMAGNETIC ELEMENT THROUGH SAID TWO APERTURES, A READ LOOP ALSO COUPLED TO SAID FERROMAGNETIC ELEMENT THROUGH SAID TWO APERTURES AND COIL MEANS MOUNTED COAXIALLY ON SAID COIL SPOOL FOR MAGNETICALLY SATURATING SAID FERROMAGNETIC ELEMENT, SAID FIRST AND SECOND FERROMAGNETIC SENSING DEVICES BEING MOUNTED IN TANDEM WITH A SPACE THEREBETWEEN TO SUBSTANTIALLY ELIMINATE MAGNETIC INTERACTION, AND A PAIR OF CONTACT PROTECTION NETWORKS FOR SAID SENSING DEVICES MOUNTED SIDE-BY-SIDE IN SAID SPACE.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-06-23 | 1967-12-23 | 1968-06-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-06-23 | 1971-12-23 | 1972-06-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-06-23 | 1975-12-23 | 1976-06-23 | $7700.00 | Window Closed / Lapsed |