Patent US3593413A successfully refreshed from Google Patents.
Patent US3303354A successfully refreshed from Google Patents.
US3303354A
Expired / Lapsed
US
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Temperature stable low frequency filter without inductance
Assignee: Collins Radio Co
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Filing: 1963-12-16
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Granted: 1967-02-07
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Expires: 1983-12-16
Abstract
No abstract record available.
Inventors
- 👤 Carroll Richard Walter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 09:34
CPC Classifications
H; H03; H03H; H03H11/00; H03H11/02; H03H11/40; H03H11/44; H03H11/04; H03H11/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
82 words
A FILTER NETWORK FOR USE WITH A TWO LINE SYSTEM COMPRISING: A FIRST AND A SECOND PASSIVE RESISTIVE CAPACITIVE FILTER, A NEGATIVE IMPEDANCE CONVERTER CONNECTED BETWEEN SAID FIRST AND SECOND RESISTIVE CAPACITIVE FILTERS, SAID NEGATIVE IMPEDANCE CONVERTER COMPRISING A FIRST AMPLIFIER MEANS CONNECTED IN ONE OF SAID LINES; A SECOND AMPLIFIER MEANS CONNECTED BETWEEN THE OTHER OF SAID LINES AND SAID FIRST AMPLIFIER MEANS AT A JUNCTION POINT, AND A THIRD AMPLIFIER MEANS CONNECTED BETWEEN SAID JUNCTION POINT AND SAID OTHER LINE.
Claim 2
Dependent Claim
82 words
A FILTER NETWORK FOR USE WITH A TWO LINE SYSTEM COMPRISING: A FIRST AND A SECOND PASSIVE RESISTIVE CAPACITIVE FILTER, A NEGATIVE IMPEDANCE CONVERTER CONNECTED BETWEEN SAID FIRST AND SECOND RESISTIVE CAPACITIVE FILTERS, SAID NEGATIVE IMPEDANCE CONVERTER COMPRISING A FIRST AMPLIFIER MEANS CONNECTED IN ONE OF SAID LINES; A SECOND AMPLIFIER MEANS CONNECTED BETWEEN THE OTHER OF SAID LINES AND SAID FIRST AMPLIFIER MEANS AT A JUNCTION POINT, AND A THIRD AMPLIFIER MEANS CONNECTED BETWEEN SAID JUNCTION POINT AND SAID OTHER LINE.
References Cited (Backward Citations)
US3204048A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-02-06 | 1970-08-08 | 1971-02-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-02-06 | 1974-08-08 | 1975-02-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-02-06 | 1978-08-08 | 1979-02-07 | $7700.00 | Window Closed / Lapsed |