US3156777A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Balanced lockout line circuit
Assignee: TDK Micronas GmbH
•
Filing: 1959-07-13
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Granted: 1964-11-10
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Expires: 1979-07-13
Abstract
No abstract record available.
Inventors
- 👤 Horwitz Henry Leopold
- 👤 Cox John Edward
- 👤 Westhead Stanley John
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 21:48
CPC Classifications
H; H04; H04Q; H04Q3/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
96 words
IN A TELEPHONE SYSTEM OUTGOING AUTOMATIC SWITCHING MEANS, INCOMING AUTOMATIC SWITCHING MEANS, A TWOWIRE TELEPHONE LINE AND A TWO RELAY LINE CIRCUIT CONNECTED TO SAID TELEPHONE LINE COMPRISING: MEANS RESPONSIVE TO OUTGOING CALLS FOR TRANSMITTING CALL INDICATIONS TO START SAID OUTGOING AUTOMATIC SWITCHING MEANS; MEANS RESPONSIVE TO CONDITIONS REQUIRING LOCKOUT FOR CONNECTING BATTERY POTENTIAL TO SAID LINE, FOR MARKING SAID LINE BUSY, AND FOR TRANSMITTING AN ALARM; MEANS RESPONSIVE TO INCOMING CALLS FOR INTERCONNECTING SAID TELEPHONE LINE AND SAID INCOMING AUTOMATIC SWITCHING MEANS; AND MEANS FOR MAINTAINING THE IMPEDANCE TO GROUND OF EACH OF SAID TWO-
Claim 2
Dependent Claim
96 words
IN A TELEPHONE SYSTEM OUTGOING AUTOMATIC SWITCHING MEANS, INCOMING AUTOMATIC SWITCHING MEANS, A TWOWIRE TELEPHONE LINE AND A TWO RELAY LINE CIRCUIT CONNECTED TO SAID TELEPHONE LINE COMPRISING: MEANS RESPONSIVE TO OUTGOING CALLS FOR TRANSMITTING CALL INDICATIONS TO START SAID OUTGOING AUTOMATIC SWITCHING MEANS; MEANS RESPONSIVE TO CONDITIONS REQUIRING LOCKOUT FOR CONNECTING BATTERY POTENTIAL TO SAID LINE, FOR MARKING SAID LINE BUSY, AND FOR TRANSMITTING AN ALARM; MEANS RESPONSIVE TO INCOMING CALLS FOR INTERCONNECTING SAID TELEPHONE LINE AND SAID INCOMING AUTOMATIC SWITCHING MEANS; AND MEANS FOR MAINTAINING THE IMPEDANCE TO GROUND OF EACH OF SAID TWO-
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-11-10 | 1968-05-11 | 1968-11-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-11-10 | 1972-05-11 | 1972-11-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-11-10 | 1976-05-11 | 1976-11-10 | $7700.00 | Window Closed / Lapsed |