Patent US3156775A successfully refreshed from Google Patents.
US3156775A
Expired / Lapsed
US
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Telephone converter
Assignee: TDK Micronas GmbH
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Filing: 1959-12-02
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Granted: 1964-11-10
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Expires: 1979-12-02
Abstract
No abstract record available.
Inventors
- 👤 Anthony M Ioakimidis
- 👤 Donald E Hutson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 04:08
CPC Classifications
H; H04; H04Q; H04Q1/00; H04Q1/18; H04Q1/30; H04Q1/44; H04Q1/444; H04Q1/446; H04Q1/4465
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
164 words
IN A TELEPHONE SYSTEM, A PLURALITY OF EXCHANGES HAVING DISSIMILAR SIGNALLING SYSTEMS, SOME OF SAID EXCHANGES INCLUDING CONVENTIONAL COMMON BATTERY OR RING-DOWN EQUIPMENT AND OTHER OF SAID EXCHANGES INCLUDING MULTIFREQUENCY ELECTRONIC SWITCHING EQUIPMENT, CONVERTER MEANS FOR CONVERTING SIGNALS EMANATING FROM A SIGNALLING ONE OF SAID EXCHANGES TO SIGNALS WHICH ARE USABLE AT A SIGNALLED ONE OF SAID EXCHANGES, MEANS COMPRISING A COMMUNICATION CHANNEL FOR INTERCONNECTING SAID CONVENTIONAL AND SAID ELECTRONIC EQUIPMENT VIA SAID CONVERTER MEANS, MEANS FOR TRANSMITTING OVER SAID CHANNEL AT LEAST ONE OF SAID SIGNALS BETWEEN SAID CONVENTIONAL EQUIPMENT AND SAID CONVERTING MEANS IN THE FORM OF BURSTS OF RINGING SIGNALS OF RELATIVELY HIGH STRENGTH, MEANS FOR TRANSMITTING OVER SAID CHANNEL AT LEAST SOME OF SAID SIGNALS BETWEEN SAID ELECTRONIC EQUIPMENT AND SAID CONVERTING MEANS IN THE FORM OF TONES, MEANS FOR TRANSMITTING RELATIVELY LOW STRENGTH VOICE SIGNALS OVER SAID CHANNEL AND MEANS IN SAID CONVERTING MEANS FOR DETECTING SAID RINGING SIGNALS RESPONSIVE TO THE STRENGTH OF SIGNALS RECEIVED OVER SAID CHANNEL.
Claim 2
Dependent Claim
164 words
IN A TELEPHONE SYSTEM, A PLURALITY OF EXCHANGES HAVING DISSIMILAR SIGNALLING SYSTEMS, SOME OF SAID EXCHANGES INCLUDING CONVENTIONAL COMMON BATTERY OR RING-DOWN EQUIPMENT AND OTHER OF SAID EXCHANGES INCLUDING MULTIFREQUENCY ELECTRONIC SWITCHING EQUIPMENT, CONVERTER MEANS FOR CONVERTING SIGNALS EMANATING FROM A SIGNALLING ONE OF SAID EXCHANGES TO SIGNALS WHICH ARE USABLE AT A SIGNALLED ONE OF SAID EXCHANGES, MEANS COMPRISING A COMMUNICATION CHANNEL FOR INTERCONNECTING SAID CONVENTIONAL AND SAID ELECTRONIC EQUIPMENT VIA SAID CONVERTER MEANS, MEANS FOR TRANSMITTING OVER SAID CHANNEL AT LEAST ONE OF SAID SIGNALS BETWEEN SAID CONVENTIONAL EQUIPMENT AND SAID CONVERTING MEANS IN THE FORM OF BURSTS OF RINGING SIGNALS OF RELATIVELY HIGH STRENGTH, MEANS FOR TRANSMITTING OVER SAID CHANNEL AT LEAST SOME OF SAID SIGNALS BETWEEN SAID ELECTRONIC EQUIPMENT AND SAID CONVERTING MEANS IN THE FORM OF TONES, MEANS FOR TRANSMITTING RELATIVELY LOW STRENGTH VOICE SIGNALS OVER SAID CHANNEL AND MEANS IN SAID CONVERTING MEANS FOR DETECTING SAID RINGING SIGNALS RESPONSIVE TO THE STRENGTH OF SIGNALS RECEIVED OVER SAID CHANNEL.
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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 |