US3130277A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Order wire and alarm circuits
Assignee: AT&T Inc
•
Filing: 1960-12-29
•
Granted: 1964-04-21
•
Expires: 1980-12-29
Abstract
No abstract record available.
Inventors
- 👤 Joseph R Buotte
- 👤 John A Word
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 02:31
CPC Classifications
H; H04; H04B; H04B17/00; H04B17/40; H04B17/401; H04B17/402; H04B17/404
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
126 words
IN A COMMUNICATION SYSTEM COMPRISING A MAIN STATION AND A PLURALITY OF SUBSIDIARY STATIONS, AN ALARM SIGNALING CHANNEL FORMING A LOOP LINKING ALL OF SAID STATIONS, TRANSMITTING MEANS AT SAID MAIN STATION FOR IMPRESSING A FIRST SIGNAL TO SAID LOOP, MEANS AT SAID MAIN STATION FOR RECEIVING SAID SIGNAL OVER SAID LOOP, MEANS AT EACH SUBSIDIARY STATION FOR INTERRUPTING SAID LOOP IN THE EVENT OF TROUBLE AT THE RESPECTIVE STATION, ADDITIONAL MEANS AT SAID MAIN STATION FOR SELECTIVELY APPLYING TO SAID LOOP SIGNALS HAVING DIFFERENT FREQUENCIES INDIVIDUAL TO SAID SUBSIDIARY STATIONS, MEANS AT EACH SUBSIDIARY STATION BRIDGING SAID LOOP FOR ONLY THE SIGNAL INDIVIDUAL TO THAT STATION IN THE ABSENCE OF SPECIFIED TROUBLE CONDITIONS AT THAT STATION, AND MEANS AT EACH SUBSIDIARY STATION FOR PERIDICALLY INTER-
Claim 2
Dependent Claim
126 words
IN A COMMUNICATION SYSTEM COMPRISING A MAIN STATION AND A PLURALITY OF SUBSIDIARY STATIONS, AN ALARM SIGNALING CHANNEL FORMING A LOOP LINKING ALL OF SAID STATIONS, TRANSMITTING MEANS AT SAID MAIN STATION FOR IMPRESSING A FIRST SIGNAL TO SAID LOOP, MEANS AT SAID MAIN STATION FOR RECEIVING SAID SIGNAL OVER SAID LOOP, MEANS AT EACH SUBSIDIARY STATION FOR INTERRUPTING SAID LOOP IN THE EVENT OF TROUBLE AT THE RESPECTIVE STATION, ADDITIONAL MEANS AT SAID MAIN STATION FOR SELECTIVELY APPLYING TO SAID LOOP SIGNALS HAVING DIFFERENT FREQUENCIES INDIVIDUAL TO SAID SUBSIDIARY STATIONS, MEANS AT EACH SUBSIDIARY STATION BRIDGING SAID LOOP FOR ONLY THE SIGNAL INDIVIDUAL TO THAT STATION IN THE ABSENCE OF SPECIFIED TROUBLE CONDITIONS AT THAT STATION, AND MEANS AT EACH SUBSIDIARY STATION FOR PERIDICALLY INTER-
References Cited (Backward Citations)
US2315434A
Cited
US2315435A
Cited
US2581056A
Cited
US2580097A
Cited
GB734721A
Cited
US2892895A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-04-21 | 1967-10-21 | 1968-04-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-04-21 | 1971-10-21 | 1972-04-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-04-21 | 1975-10-21 | 1976-04-21 | $7700.00 | Window Closed / Lapsed |