US3566284A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Active rc wave transmission network having a 360 degree non-minimum phase transfer function
Assignee: AT&T Inc
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Filing: 1967-12-29
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Granted: 1971-02-23
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Expires: 1987-12-29
Abstract
Abstract IN A RESISTANCE-CAPACITANCE TRANSMISSION NETWORK THE INPUT SIGNAL IS FIRST APPLIED TO TWO SEPARATE FILTER NETWORKS BOTH OF WHICH HAVE POSITIVE TRANSFER FUNCTIONS. ONE OF THE NETWORKS IS PASSIVE AND HAS A FIRST ORDER TRANSFER FUNCTION WHEREAS THE OTHER NETWORK IS ACTIVE AND HAS A SECOND ORDER TRANSFER FUNCTION. THE INDIVIDUAL OUTPUTS OF THE FILTER NETWORKS ARE SUBTRACTED FROM EACH OTHER IN A SUBTRACTING CIRCUIT WHICH MAY TAKE THE FORM OF A DIFFERENTIAL AMPLIFIER. THE RESULTING OUTPUT SIGNAL HAS A 360* NONMINIMUM PHASE TRANSFER FUNCTION WITHOUT HAVING REQUIRED ANY INDUCTORS IN THE WAVE TRANSMISSION NETWORK.
Inventors
- 👤 William Thelen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 12:40
CPC Classifications
H; H03; H03H; H03H11/00; H03H11/02; H03H11/04; H03H11/12; H03H11/1295
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-02-22 | 1974-08-24 | 1975-02-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-22 | 1978-08-24 | 1979-02-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-22 | 1982-08-24 | 1983-02-23 | $7700.00 | Window Closed / Lapsed |