US3201706A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tuning system
Assignee: Phillips Petroleum Co
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Filing: 1960-05-09
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Granted: 1965-08-17
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Expires: 1980-05-09
Abstract
No abstract record available.
Inventors
- 👤 Raymond G Piety
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 05:06
CPC Classifications
H; H03; H03H; H03H15/00; G; G01; G01V; G01V1/00; G01V1/28; G01V1/36; G01V1/364; G01V2210/00; G01V2210/20; G01V2210/27
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
156 words
A DELAY LINE FILTER COMPRISING A LOW PASS SECTION HAVING A THREE-POLE BUTTERWORTH FILTER CONNECTED IN CASCADE WITH A FOUR-POLE BUTTERWORTH FILTER, SAID LOW PASS SECTION BEING CONSTRUCTED TO PASS FREQUENCIES IN THE RANGE OF 0 TO 100 CYCLES PER SECOND, AND AN ALL PASS PHASE ADJUSTING NETWORK CONNECTED IN SERIES WITH SAID BUTTERWORTH FILTERS; AN ALL PASS FILTER SECTION CONNECTED IN SERIES WITH SAID LOW PASS SECTION, SAID ALL PASS FILTER SECTION COMPRISING A PLURALITY OF CASCADE-CONNECTED ALL PASS FILTER NETWORKS HAVING ONE HALF THE TIME DELAY OF SAID PHASE ADJUSTING NETWORK; FIRST AND SECOND OUTPUT SIGNAL BUSES; SWITCHING MEANS TO CONNECT THE OUTPUTS TO SELECTED ONES OF SAID ALL PASS FILTER NETWORKS SELECTIVELY TO SAID FIRST AND SECOND BUSES; AND MEANS CONNECTED TO SAID BUSES TO COMBINE THE SIGNALS APPLIED TO SAID FIRST AND SECOND BUSES SO THAT SIGNALS APPLIED TO SAID SECOND BUS ARE SUBSTRACTED FROM THE SIGNALS APPLIED TO SAID FIRST BUS.
Claim 2
Dependent Claim
156 words
A DELAY LINE FILTER COMPRISING A LOW PASS SECTION HAVING A THREE-POLE BUTTERWORTH FILTER CONNECTED IN CASCADE WITH A FOUR-POLE BUTTERWORTH FILTER, SAID LOW PASS SECTION BEING CONSTRUCTED TO PASS FREQUENCIES IN THE RANGE OF 0 TO 100 CYCLES PER SECOND, AND AN ALL PASS PHASE ADJUSTING NETWORK CONNECTED IN SERIES WITH SAID BUTTERWORTH FILTERS; AN ALL PASS FILTER SECTION CONNECTED IN SERIES WITH SAID LOW PASS SECTION, SAID ALL PASS FILTER SECTION COMPRISING A PLURALITY OF CASCADE-CONNECTED ALL PASS FILTER NETWORKS HAVING ONE HALF THE TIME DELAY OF SAID PHASE ADJUSTING NETWORK; FIRST AND SECOND OUTPUT SIGNAL BUSES; SWITCHING MEANS TO CONNECT THE OUTPUTS TO SELECTED ONES OF SAID ALL PASS FILTER NETWORKS SELECTIVELY TO SAID FIRST AND SECOND BUSES; AND MEANS CONNECTED TO SAID BUSES TO COMBINE THE SIGNALS APPLIED TO SAID FIRST AND SECOND BUSES SO THAT SIGNALS APPLIED TO SAID SECOND BUS ARE SUBSTRACTED FROM THE SIGNALS APPLIED TO SAID FIRST BUS.
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) | 1968-08-16 | 1969-02-15 | 1969-08-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-08-16 | 1973-02-15 | 1973-08-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-08-16 | 1977-02-15 | 1977-08-17 | $7700.00 | Window Closed / Lapsed |