US3083267A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pcm telephone signaling
Assignee: AT&T Inc
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Filing: 1960-10-20
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Granted: 1963-03-26
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Expires: 1980-10-20
Abstract
No abstract record available.
Inventors
- 👤 David C Weller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 20:55
CPC Classifications
H; H04; H04J; H04J3/00; H04J3/02; H04J3/12; H04Q; H04Q11/00; H04Q11/04
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
167 words
IN A PULSE CODE MODULATION MESSAGE TRANSMISSION SYSTEM INTERCONNECTING A PAIR OF TERMINALS AND EMPLOYING A PREDETERMINED NUMBER OF DIGIT SPACES FOR MESSAGE TRANSMISSION, AN ARRANGEMENT FOR TRANSMITTING A PAIR OF TWOSTATE DIRECT-CURRENT SIGNALS SIMULTANEOUSLY IN THE SAME DIRECTION BETWEEN SAID TERMINALS WHICH COMPRISES MEANS FOR ADDING A FURTHER DIGIT SPACE EXCLUSIVE OF SAID MESSAGE DIGIT SPACES, MEANS FOR DETECTING THE STATE OF A FIRST OF SAID DIRECT-CURRENT SIGNALS AT A FIRST OF SAID TERMINALS, MEANS TO TRANSMIT BINARY "1" IN SAID ADDED DIGIT SPACE IN RESPONSE TO ONE STATE OF SAID FIRST DIRECT-CURRENT SIGNAL AND BINARY "0" IN RESPONSE TO THE OTHER, MEANS FOR DETECTING THE STATE OF THE SECOND OF SAID DIRECT-CURRENT SIGNALS AT SAID FIRST TERMINALS, MEANS TO TRANSMIT BINARY "1" IN THE LEAST SIGNIFICANT OF SAID MESSAGE DIGIT SPACES IN RESPONSE TO ONE STATE OF SAID SECOND DIRECT-CURRENT SIGNAL AND BINARY "0" IN RESPONSE TO THE OTHER, MEANS TO RECONSTRUCT THE DETECTED STATE OF SAID FIRST DIRECT-CURRENT SIGNAL IN RESPONSE TO THE CON-
References Cited (Backward Citations)
US2438903A
Cited
US2946044A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1966-03-25 | 1966-09-24 | 1967-03-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-03-25 | 1970-09-24 | 1971-03-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-03-25 | 1974-09-24 | 1975-03-26 | $7700.00 | Window Closed / Lapsed |