US3380004A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Aperiodic low-pass filter
Assignee: MCMILLAN CORP OF NORTH CAROLINA
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Filing: 1962-01-29
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Granted: 1968-04-23
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Expires: 1982-01-29
Abstract
No abstract record available.
Inventors
- 👤 Frithjof N Hansen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 15:23
CPC Classifications
H; H03; H03H; H03H1/00; H03H1/0007; H01; H01F; H01F1/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
115 words
A LOW-PASS FILTER COMPRISING: AN ELONGATED ELECTRICALLY CONDUCTIVE SLEEVE MEMBER, SAID SLEEVE MEMBER WHEN SAID FILTER IS IN OPERATION, BEING GROUNDED, A POWER CONDUCTOR EXTENDING LONGITUDINALLY OF SAID SLEEVE MEMBER, SAID CONDUCTOR BEING SPACED FROM AND ENCLOSED WITHIN SAID SLEEVE MEMBER, A QUANTITY OF LOSSY MAGNETIC MATERIAL SUBSTANTIALLY FILLING THE SPACE WITHIN SAID SLEEVE MEMBER, SAID LOSSY MATERIAL CONSISTING ESSENTIALLY OF A MIXTURE OF FINELY DIVIDED ELECTRICALLY CONDUCTIVE MAGNETIC MATERIAL AND A RESIN, THE ELECTRICAL CONDUCTIVITY OF SAID MIXTURE RENDERING SAID FILTER APERIODIC IN ITS PERFORMANCE, AND INSULATING MEANS INSULATING SAID CONDUCTOR ELECTRICALLY FROM SAID SLEEVE MEMBER, THE THICKNESS OF SAID INSULATING MEANS BEING OF THE ORDER OF NOT EXCEEDING THREE ONE-THOUSANDTHS OF AN INCH.
Claim 2
Dependent Claim
115 words
A LOW-PASS FILTER COMPRISING: AN ELONGATED ELECTRICALLY CONDUCTIVE SLEEVE MEMBER, SAID SLEEVE MEMBER WHEN SAID FILTER IS IN OPERATION, BEING GROUNDED, A POWER CONDUCTOR EXTENDING LONGITUDINALLY OF SAID SLEEVE MEMBER, SAID CONDUCTOR BEING SPACED FROM AND ENCLOSED WITHIN SAID SLEEVE MEMBER, A QUANTITY OF LOSSY MAGNETIC MATERIAL SUBSTANTIALLY FILLING THE SPACE WITHIN SAID SLEEVE MEMBER, SAID LOSSY MATERIAL CONSISTING ESSENTIALLY OF A MIXTURE OF FINELY DIVIDED ELECTRICALLY CONDUCTIVE MAGNETIC MATERIAL AND A RESIN, THE ELECTRICAL CONDUCTIVITY OF SAID MIXTURE RENDERING SAID FILTER APERIODIC IN ITS PERFORMANCE, AND INSULATING MEANS INSULATING SAID CONDUCTOR ELECTRICALLY FROM SAID SLEEVE MEMBER, THE THICKNESS OF SAID INSULATING MEANS BEING OF THE ORDER OF NOT EXCEEDING THREE ONE-THOUSANDTHS OF AN INCH.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-04-23 | 1971-10-23 | 1972-04-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-04-23 | 1975-10-23 | 1976-04-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-04-23 | 1979-10-23 | 1980-04-23 | $7700.00 | Window Closed / Lapsed |