Patent US1028084A successfully refreshed from Google Patents.
Patent US5450052A successfully refreshed from Google Patents.
US5450052A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetically variable inductor for high power audio and radio frequency applications
Assignee: Boeing North American Inc
•
Filing: 1993-12-17
•
Granted: 1995-09-12
•
Expires: 2013-12-17
Abstract
Abstract A magnetically variable inductor for high power, high frequency applications which includes a solenoid with a magnetic core therein, disposed coaxially around a conductor for carrying the high power, high frequency signal and a variable current source coupled with the solenoid so that a manipulation of the current through the solenoid results in a variable inductance for said conductor. Also disclosed are additional features of ferrite rings disposed around each end of the magnetic core, a shield disposed between the core and the solenoid, and a sheath disposed around the solenoid.
Inventors
- 👤 Ira B. Goldberg
- 👤 Jane H. Hanamoto
- 👤 Charles S. Hollingsworth
- 👤 Ted M. McKinney
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 04:12
CPC Classifications
H; H01; H01F; H01F29/00; H01F29/14; H01F29/146
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
115 words
A variable inductor comprising: a first conductor, oriented in a first direction, for carrying an AC signal, and thereby generating a first magnetic field; a solenoid for generating a second magnetic field disposed coaxially about said first conductor, so that there is no direct physical connection between the solenoid and the first conductor; a magnetic core disposed within said solenoid which is coaxially disposed about said first conductor; a variable control current source coupled with said solenoid for generating the variable second magnetic field; a first ferrite ring disposed around an end of said magnetic core; a ferrite sheath disposed about said solenoid; and, a conductive shield disposed around said core and within said solenoid.
Claim 2
Dependent Claim
115 words
A variable inductor comprising: a first conductor, oriented in a first direction, for carrying an AC signal, and thereby generating a first magnetic field; a solenoid for generating a second magnetic field disposed coaxially about said first conductor, so that there is no direct physical connection between the solenoid and the first conductor; a magnetic core disposed within said solenoid which is coaxially disposed about said first conductor; a variable control current source coupled with said solenoid for generating the variable second magnetic field; a first ferrite ring disposed around an end of said magnetic core; a ferrite sheath disposed about said solenoid; and, a conductive shield disposed around said core and within said solenoid.
References Cited (Backward Citations)
US1287982A
Cited
US2970224A
Cited
US2888637A
Cited
US2897294A
Cited
US2811652A
Cited
US2916696A
Cited
US2946030A
Cited
US3509498A
Cited
US3413485A
Cited
US3343074A
Cited
US3505588A
Cited
US4030057A
Cited
US4320337A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1998-09-11 | 1999-03-13 | 1999-09-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-09-11 | 2003-03-13 | 2003-09-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-09-11 | 2007-03-13 | 2007-09-12 | $7700.00 | Window Closed / Lapsed |