US3172958A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Telephone line supekvisoky circuit
Assignee: —
•
Filing: —
•
Granted: 1965-03-09
•
Expires: 1982-03-09
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 15:40
CPC Classifications
H; H04; H04Q; H04Q3/00; H04Q3/42; H04Q3/52; H04Q3/521
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
110 words
IN A TELEPHONE SYSTEM HAVING A PLURALITY OF LINES, A SUPERVISORY CIRCUIT FOR DETECTING THE OCCURRENCE OF FIRST AND SECOND LINE CONDITIONS COMPRISING FIRST AND SECOND SWITCHING MEANS ASSOCIATED WITH EACH LINE, MEANS FOR ENABLING SAID FIRST AND SECOND SWITCHING MEANS ALTERNATIVELY IN RESPONSE TO SAID FIRST AND SECOND LINE CONDITIONS RESPECTIVELY COMPRISING MEANS COUPLING SAID FIRST AND SECOND SWITCHING MEANS TO THE ASSOCIATED LINE IN OPPOSITE POLARITY RELATIONSHIP, AND MEANS FOR INCREASING CURRENT FLOW THROUGH THE ENABLED ONE OF SAID FIRST AND SECOND SWITCHING TO PERMIT DETECTION OF A LINE CONDITION CHANGE COMPRISING A PULSE SOURCE, MEANS RESPONSIVE TO THE ENABLING OF ONE OF SAID FIRST AND SECOND SWITCHING
Claim 2
Dependent Claim
110 words
IN A TELEPHONE SYSTEM HAVING A PLURALITY OF LINES, A SUPERVISORY CIRCUIT FOR DETECTING THE OCCURRENCE OF FIRST AND SECOND LINE CONDITIONS COMPRISING FIRST AND SECOND SWITCHING MEANS ASSOCIATED WITH EACH LINE, MEANS FOR ENABLING SAID FIRST AND SECOND SWITCHING MEANS ALTERNATIVELY IN RESPONSE TO SAID FIRST AND SECOND LINE CONDITIONS RESPECTIVELY COMPRISING MEANS COUPLING SAID FIRST AND SECOND SWITCHING MEANS TO THE ASSOCIATED LINE IN OPPOSITE POLARITY RELATIONSHIP, AND MEANS FOR INCREASING CURRENT FLOW THROUGH THE ENABLED ONE OF SAID FIRST AND SECOND SWITCHING TO PERMIT DETECTION OF A LINE CONDITION CHANGE COMPRISING A PULSE SOURCE, MEANS RESPONSIVE TO THE ENABLING OF ONE OF SAID FIRST AND SECOND SWITCHING
References Cited (Backward Citations)
US2715657A
Cited
US2829203A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-03-08 | 1968-09-07 | 1969-03-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-03-08 | 1972-09-07 | 1973-03-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-03-08 | 1976-09-07 | 1977-03-09 | $7700.00 | Window Closed / Lapsed |