Patent US3283083A successfully refreshed from Google Patents.
US3283083A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Telephone subscriber's line circuit
Assignee: AT&T Inc
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Filing: 1963-03-13
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Granted: 1966-11-01
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Expires: 1983-03-13
Abstract
No abstract record available.
Inventors
- 👤 Donald A Macleod
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 12:23
CPC Classifications
H; H04; H04M; H04M9/00; H04M9/002; H04M9/005; H04M9/006
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
123 words
IN A LINE CIRCUIT FOR A KEY TELEPHONE SYSTEM INCLUDING A SUBSCRIBER''S TELEPHONE LINE AND A TELEPHONE SET CONNECTED THERETO, LOCAL SIGNALING MEANS, MEANS RESPONSIVE TO RING CURRENT FROM A REMOTE LOCATION FOR INITIATING THE OPERATION OF SAID LOCAL SIGNALING MEANS, CIRCUIT MEANS RESPONSIVE TO THE TERMINATION OF SAID RINGING CURRENT AFTER A PREDETERMINED INTERVAL OF TIME FOLLOWING SAID TERMINATION FOR DISABLING SAID LOCAL RINGING MEANS AND MEANS FOR HOLDING SAID SUBSCRIBER''S LINE, SAID INITIATING MEANS AND SAID HOLDING MEANS EACH INCLUDING A COMMON MULTIFUNCTION RELAY CONNECTABLE ACROSS SAID TELEPHONE LINE, THE IMPEDANCE OF SAID RELAY BEING SUBSTANTIALLY EQUIVALENT TO THE IMPEDANCE OF SAID TELEPHONE SET, THEREBY AVOIDING ANY REQUIREMENT FOR A HOLDING BRIDGE NETWORK AS A PART OF SAID LINE HOLDING MEANS.
Claim 2
Dependent Claim
123 words
IN A LINE CIRCUIT FOR A KEY TELEPHONE SYSTEM INCLUDING A SUBSCRIBER''S TELEPHONE LINE AND A TELEPHONE SET CONNECTED THERETO, LOCAL SIGNALING MEANS, MEANS RESPONSIVE TO RING CURRENT FROM A REMOTE LOCATION FOR INITIATING THE OPERATION OF SAID LOCAL SIGNALING MEANS, CIRCUIT MEANS RESPONSIVE TO THE TERMINATION OF SAID RINGING CURRENT AFTER A PREDETERMINED INTERVAL OF TIME FOLLOWING SAID TERMINATION FOR DISABLING SAID LOCAL RINGING MEANS AND MEANS FOR HOLDING SAID SUBSCRIBER''S LINE, SAID INITIATING MEANS AND SAID HOLDING MEANS EACH INCLUDING A COMMON MULTIFUNCTION RELAY CONNECTABLE ACROSS SAID TELEPHONE LINE, THE IMPEDANCE OF SAID RELAY BEING SUBSTANTIALLY EQUIVALENT TO THE IMPEDANCE OF SAID TELEPHONE SET, THEREBY AVOIDING ANY REQUIREMENT FOR A HOLDING BRIDGE NETWORK AS A PART OF SAID LINE HOLDING MEANS.
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) | 1969-10-31 | 1970-05-02 | 1970-11-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-10-31 | 1974-05-02 | 1974-11-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-10-31 | 1978-05-02 | 1978-11-01 | $7700.00 | Window Closed / Lapsed |