Patent US3223783A successfully refreshed from Google Patents.
US3223783A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Time-division multiplex voice-frequency discriminator
Assignee: Fujitsu Ltd
•
Filing: 1961-05-08
•
Granted: 1965-12-14
•
Expires: 1981-05-08
Abstract
No abstract record available.
Inventors
- 👤 Yamamoto Takuma
- 👤 Nakamura Toshihiko
- 👤 Shimada Ryosaku
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 03:11
CPC Classifications
H; H04; H04J; H04J3/00; H04J3/02; H04J3/12; H04Q; H04Q1/00; H04Q1/18; H04Q1/30; H04Q1/44; H04Q1/444; H04Q1/45; H04Q1/457; H04Q11/00; H04Q11/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
130 words
IN A TIME-DIVISION MULTIPLEX-CHANNEL TRANSMISSION SYSTEM, A VOICE-FREQUENCY SIGNAL DISCRIMINATOR OF THE MULTIPLEX TIME-DIVISION COMMON TO ALL CHANNELS COMPRISING INPUT MEANS FOR RECEIVING SAMPLED VOICE-FREQUENCY SIGNALS THROUGH RESPECTIVE CHANNELS, FIRST THRESHOLD DISCRIMINATING MEANS FOR RECOGNIZING THE TIME WHEN AN INCOMING SAMPLED SINGNAL HAS EXCEEDED A FIRST PREDETERMINED THRESHOLD LEVEL, SECOND THRESHOLD DISCRIMINATING MEANS RESPONSE TO RECOGNITION BY SAID FIRST THRESHOLD DISCRIMINATING MEANS FOR PICKING UP SAMPLED INCOMING PULSES EXCEEDING A SECOND PREDETERMINED THRESHOLD LEVEL LOWER THAN SAID FIRST THRESHOLD LEVEL, PULSE EXTRACTING MEANS CONNECTED TO SAID SECOND THRESHOLD DISCRIMINATING MEANS FOR EXTRACTING A PARTICULAR PULSE FROM GROUPS OF SAID PICKED UP SAMPLED PULSES EXCEEDING THE SECOND THRESHOLD LEVEL, AND COUNTING MEANS CONNECTED TO SAID PULSE EXTRACTING MEANS FOR MEASURING A GIVEN PARAMETER OF EXTRACTED PULSES WITHIN A FIXED TIME PERIOD.
Claim 2
Dependent Claim
130 words
IN A TIME-DIVISION MULTIPLEX-CHANNEL TRANSMISSION SYSTEM, A VOICE-FREQUENCY SIGNAL DISCRIMINATOR OF THE MULTIPLEX TIME-DIVISION COMMON TO ALL CHANNELS COMPRISING INPUT MEANS FOR RECEIVING SAMPLED VOICE-FREQUENCY SIGNALS THROUGH RESPECTIVE CHANNELS, FIRST THRESHOLD DISCRIMINATING MEANS FOR RECOGNIZING THE TIME WHEN AN INCOMING SAMPLED SINGNAL HAS EXCEEDED A FIRST PREDETERMINED THRESHOLD LEVEL, SECOND THRESHOLD DISCRIMINATING MEANS RESPONSE TO RECOGNITION BY SAID FIRST THRESHOLD DISCRIMINATING MEANS FOR PICKING UP SAMPLED INCOMING PULSES EXCEEDING A SECOND PREDETERMINED THRESHOLD LEVEL LOWER THAN SAID FIRST THRESHOLD LEVEL, PULSE EXTRACTING MEANS CONNECTED TO SAID SECOND THRESHOLD DISCRIMINATING MEANS FOR EXTRACTING A PARTICULAR PULSE FROM GROUPS OF SAID PICKED UP SAMPLED PULSES EXCEEDING THE SECOND THRESHOLD LEVEL, AND COUNTING MEANS CONNECTED TO SAID PULSE EXTRACTING MEANS FOR MEASURING A GIVEN PARAMETER OF EXTRACTED PULSES WITHIN A FIXED TIME PERIOD.
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) | 1968-12-13 | 1969-06-14 | 1969-12-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-12-13 | 1973-06-14 | 1973-12-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-12-13 | 1977-06-14 | 1977-12-14 | $7700.00 | Window Closed / Lapsed |