US3300588A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Line circuits for subscribers' telephones
Assignee: Individual
•
Filing: 1963-12-27
•
Granted: 1967-01-24
•
Expires: 1983-12-27
Abstract
No abstract record available.
Inventors
- 👤 Flowers Thomas Harold
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 20:44
CPC Classifications
H; H04; H04M; H04M3/00; H04M3/005
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
109 words
A LINE CIRCUIT FOR A SUBSCRIBER''S TELEPHONE INSTRUMENT COMPRISING IN COMBINATION FIRST AND SECOND LINE CONDUCTORS, A SUBSCRIBER''S LINE TRANSFORMER, AN INPUT WINDING ON SAID TRANSFORMER IN SERIES CONNECTION WITH SAID FIRST AND SECOND CONDUCTORS, A FIRST SOURCE OF LINE FEED CURRENT, CONNECTION FROM SAID FIRST SOURCE TO SAID INPUT WINDING TO PROVIDE FEED CURRENT THROUGH SAID INPUT WINDING TO SAID CONDUCTORS, A SECOND SOURCE OF LINE FEED CURRENT, AND CONNECTION MEANS OF HIGH IMPEDANCE TO CURRENTS OF SPEECH FREQUENCY CONNECTING THE SAID SECOND SOURCE ACROSS SAID FIRST AND SECOND CONDUCTORS IN PARALLEL CONNECTION WITH SAID INPUT WINDING TO PROVIDE FEED CURRENT DIRECT TO SAID FIRST AND SECOND CONDUCTORS.
Claim 2
Dependent Claim
109 words
A LINE CIRCUIT FOR A SUBSCRIBER''S TELEPHONE INSTRUMENT COMPRISING IN COMBINATION FIRST AND SECOND LINE CONDUCTORS, A SUBSCRIBER''S LINE TRANSFORMER, AN INPUT WINDING ON SAID TRANSFORMER IN SERIES CONNECTION WITH SAID FIRST AND SECOND CONDUCTORS, A FIRST SOURCE OF LINE FEED CURRENT, CONNECTION FROM SAID FIRST SOURCE TO SAID INPUT WINDING TO PROVIDE FEED CURRENT THROUGH SAID INPUT WINDING TO SAID CONDUCTORS, A SECOND SOURCE OF LINE FEED CURRENT, AND CONNECTION MEANS OF HIGH IMPEDANCE TO CURRENTS OF SPEECH FREQUENCY CONNECTING THE SAID SECOND SOURCE ACROSS SAID FIRST AND SECOND CONDUCTORS IN PARALLEL CONNECTION WITH SAID INPUT WINDING TO PROVIDE FEED CURRENT DIRECT TO SAID FIRST AND SECOND CONDUCTORS.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-01-23 | 1970-07-25 | 1971-01-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-01-23 | 1974-07-25 | 1975-01-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-01-23 | 1978-07-25 | 1979-01-24 | $7700.00 | Window Closed / Lapsed |