US3231677A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Inter-register signalling for electronic telephone system
Assignee: Telefonaktiebolaget LM Ericsson AB
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Filing: 1962-04-13
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Granted: 1966-01-25
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Expires: 1982-04-13
Abstract
No abstract record available.
Inventors
- 👤 Edstrom Nils Herbert
- 👤 Katzeff Kurt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 07:16
CPC Classifications
H; H04; H04Q; H04Q11/00; H04Q11/04; H04L; H04L27/00; H04L27/26; H04L27/30
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
140 words
A CIRCUIT SYSTEM FOR SUPERVISING THE RECEPTION OF DIGITS REPRESENTING SIGNALS IN A TELEPHONE SYSTEM, SAID CIRCUIT SYSTEM COMPRISING A FIRST REGISTER INCLUDING SIGNALTRANSMITTING MEANS FOR SENDING DIGIT-REPRESENTING SIGNALS, SAID SIGNALS INCLUDING COMBINATIONS OF AT LEAST TWO DISTINCT VOICE FREQUENCIES AND BEING GROUPED IN AT LEAST TWO GROUPS OF FREQUENCIES HAVING DIFFERENT FREQUENCY RANGES, AN EQUAL NUMBER OF FREQUENCIES BEING LOCATED ON OPPOSITE SIDES OF A SYMMETRY LINE IN THE FREQUENCY SPECTRUM OF THE RESPECTIVE RANGE, AND A SECOND REGISTER INCLUDING MEANS FOR RECEIVING SAID SIGNALS AND REVERTIVE MEANS FOR SENDING BACK TO SAID FIRST REGISTER SIGNALS CONSISTING OF COMBINATIONS OF VOICE FREQUENCIES IN WHICH EACH OF SAID DISTINCT FREQUENCIES IN THE RESPECTIVE RANGE HAS THE SAME SEQUENCE NUMBER IN REFERENCE TO THE RESPECTIVE SYMMETRY LINE AS IN THE RECEIVED SIGNAL, BUT IN THE OPPOSITE SENSE OF THE VOICE SPECTRUM.
Claim 2
Dependent Claim
140 words
A CIRCUIT SYSTEM FOR SUPERVISING THE RECEPTION OF DIGITS REPRESENTING SIGNALS IN A TELEPHONE SYSTEM, SAID CIRCUIT SYSTEM COMPRISING A FIRST REGISTER INCLUDING SIGNALTRANSMITTING MEANS FOR SENDING DIGIT-REPRESENTING SIGNALS, SAID SIGNALS INCLUDING COMBINATIONS OF AT LEAST TWO DISTINCT VOICE FREQUENCIES AND BEING GROUPED IN AT LEAST TWO GROUPS OF FREQUENCIES HAVING DIFFERENT FREQUENCY RANGES, AN EQUAL NUMBER OF FREQUENCIES BEING LOCATED ON OPPOSITE SIDES OF A SYMMETRY LINE IN THE FREQUENCY SPECTRUM OF THE RESPECTIVE RANGE, AND A SECOND REGISTER INCLUDING MEANS FOR RECEIVING SAID SIGNALS AND REVERTIVE MEANS FOR SENDING BACK TO SAID FIRST REGISTER SIGNALS CONSISTING OF COMBINATIONS OF VOICE FREQUENCIES IN WHICH EACH OF SAID DISTINCT FREQUENCIES IN THE RESPECTIVE RANGE HAS THE SAME SEQUENCE NUMBER IN REFERENCE TO THE RESPECTIVE SYMMETRY LINE AS IN THE RECEIVED SIGNAL, BUT IN THE OPPOSITE SENSE OF THE VOICE SPECTRUM.
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) | 1969-01-24 | 1969-07-26 | 1970-01-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-01-24 | 1973-07-26 | 1974-01-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-01-24 | 1977-07-26 | 1978-01-25 | $7700.00 | Window Closed / Lapsed |