US3328528A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for interchanging time and frequency signals
Assignee: AT&T Inc
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Filing: 1963-11-04
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Granted: 1967-06-27
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Expires: 1983-11-04
Abstract
No abstract record available.
Inventors
- 👤 Darlington Sidney
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 22:34
CPC Classifications
H; H04; H04J; H04J4/00; H04J4/005; H04B; H04B1/00; H04B1/66; H04J3/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
180 words
APPARATUS FOR CONVERTING A SEQUENCE OF TIME DIVISION MULTIPLEX SIGNALS OCCURRING DURING IME INTERVAL OF T TO FREQUENCY OF DIVISION MULTIPLEX SIGNALS WHICH COMPRISES A MULTIPLEXER, A SHAPING NETWORK HAVING AN INPUT AND AN OUTPUT, SAID INPUT BEING CONNECTED TO SAID MULTIPLEXER, SAID SHAPING NETWORK HAVING A TRANSFER FUNCTION GIVING RISE TO A SEQUENCE OF SINC SIGNALS IN RESPONSE TO SAID SEQUENCE OF TIME DIVISION MULTIPLEX SIGNALS, A SWEEP FREQUENCY GENERATOR HAVING AN INPUT AND AN OUTPUT, A SYNCHRONIZER INTERCONNECTING THE INPUT OF SAID SHAPING NETWORK WITH THE INPUT OF SAID SWEEP GENERATOR, A MIXER INTERCONNECTING THE OUTPUT OF SAID SHAPING NETWORK WITH THE OUTPUT OF SAID SWEEP FREQUENCY GENERATOR, AND A DISPERSIVE LINE HAVING AN INPUT AND OUTPUT, THE INPUT OF SAID LINE BEING CONNECTED TO SAID MIXER, SAID DISPERIVE LINE ARRANGED TO PROVIDE FOR DISPERSING THE FREQUENCY CONSTITUENTS OF SIGNALS APPLIED AT SAID INPUT OF SAID DISPERSIVE LINE BY AN AMOUNT DIRECTLY PROPORTIONAL TO THE NUMBER OF TIME DIVISION SIGNALS IN TIME INTERVAL T AND INVERSELY PROPORTIONAL TO T2 THEREBY OBTAINING FREQUENCY DIVISION MULTIPLEX SIGNALS AT THE OUTPUT.
Claim 2
Dependent Claim
180 words
APPARATUS FOR CONVERTING A SEQUENCE OF TIME DIVISION MULTIPLEX SIGNALS OCCURRING DURING IME INTERVAL OF T TO FREQUENCY OF DIVISION MULTIPLEX SIGNALS WHICH COMPRISES A MULTIPLEXER, A SHAPING NETWORK HAVING AN INPUT AND AN OUTPUT, SAID INPUT BEING CONNECTED TO SAID MULTIPLEXER, SAID SHAPING NETWORK HAVING A TRANSFER FUNCTION GIVING RISE TO A SEQUENCE OF SINC SIGNALS IN RESPONSE TO SAID SEQUENCE OF TIME DIVISION MULTIPLEX SIGNALS, A SWEEP FREQUENCY GENERATOR HAVING AN INPUT AND AN OUTPUT, A SYNCHRONIZER INTERCONNECTING THE INPUT OF SAID SHAPING NETWORK WITH THE INPUT OF SAID SWEEP GENERATOR, A MIXER INTERCONNECTING THE OUTPUT OF SAID SHAPING NETWORK WITH THE OUTPUT OF SAID SWEEP FREQUENCY GENERATOR, AND A DISPERSIVE LINE HAVING AN INPUT AND OUTPUT, THE INPUT OF SAID LINE BEING CONNECTED TO SAID MIXER, SAID DISPERIVE LINE ARRANGED TO PROVIDE FOR DISPERSING THE FREQUENCY CONSTITUENTS OF SIGNALS APPLIED AT SAID INPUT OF SAID DISPERSIVE LINE BY AN AMOUNT DIRECTLY PROPORTIONAL TO THE NUMBER OF TIME DIVISION SIGNALS IN TIME INTERVAL T AND INVERSELY PROPORTIONAL TO T2 THEREBY OBTAINING FREQUENCY DIVISION MULTIPLEX SIGNALS AT THE OUTPUT.
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) | 1970-06-26 | 1970-12-26 | 1971-06-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-06-26 | 1974-12-26 | 1975-06-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-06-26 | 1978-12-26 | 1979-06-27 | $7700.00 | Window Closed / Lapsed |