Patent US3706076A successfully refreshed from Google Patents.
US3706076A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Programmable digital filter apparatus
Assignee: AT&T Inc
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Filing: 1970-12-21
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Granted: 1972-12-12
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Expires: 1990-12-21
Abstract
Abstract A DIGITAL FILTER WITH DATA MEMORIES ARRANGED IN THE CONFIGURATION OF A FILTER OF RELATIVELY LOW ORDER (E.G., SECOND ORDER) AND WITH A SINGLE TIME-SHARED ARITHMETIC UNIT UNDER THE CONTROL OF INSTRUCTION AND COEFFICIENT MEMORIES. THE DATA, INSTRUCTION, AND COEFFICIENT MEMORIES OF THE FILTER ARE ARRANGED TO PERMIT THE REALIZATION OF FILTER TRANSFER FUNCTION OF ARBITRARY ORDER ON DATA FROM AN ARBITRARY NUMBER OF SOURCES. THE FILTER IS READILY PROGRAMMABLE WITH RESPECT TO THE ORDER OF THE FILTER FUNCTIONS TO BE REALIZED, THE NUMBER OF SOURCES OF DATA TO BE PROCESSED, AND THE FILTER COEFFICIENTS TO BE USED.
Inventors
- 👤 Paul Alfred Schuster
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:41
CPC Classifications
H; H03; H03H; H03H17/00; H03H17/02; H03H17/0294; H03H17/0283; H03H17/0286; H03H17/04
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) | 1975-12-12 | 1976-06-12 | 1976-12-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-12-12 | 1980-06-12 | 1980-12-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-12-12 | 1984-06-12 | 1984-12-12 | $7700.00 | Window Closed / Lapsed |