US4220907A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electromagnetic power generator
Assignee: Individual
•
Filing: 1978-07-27
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Granted: 1980-09-02
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Expires: 1998-07-27
Abstract
Abstract An electromagnetic power generator for installation in the interior of a vehicular tire, working on the principle of deriving energy from the fact that a portion of the tire becomes flattened once every revolution, causing a change in the length of the corresponding chord. A small closed magnetic circuit is alternately opened and closed by this movement, by means of a flexible strap coupled between the tire interior and the magnetic circuit. The circuit is reclosed by magnetic attraction.
Inventors
- 👤 Dennis G. Pappas
- 👤 Matthew C. Baum
- 👤 Samuel N. Small
- 👤 Robert T. Adams
- 👤 Robert P. Freedman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 21:26
CPC Classifications
H; H02; H02K; H02K35/00; H02K7/00; H02K7/18; H02K7/1869; H02K7/1876
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
124 words
An electro-magnetic power generator for use inside a vehicular tire and the like, comprising a core having a coil wound around at least a portion thereof; a movable bar normally closing a magnetic circuit through said core; one of said core or movable bar being permanently magnetized, and a flexible restraining member constrained to follow movement of the inner tire periphery, holding with one of its portions said movable member and holding said core with another of its portions, intermittently to move the movable member away from said core during rotation of the tire when the same slightly flattens upon contact with the ground, whereupon magnetic attraction pulls back said bar to said core, and a small electromotive force is induced in said coil.
Claim 2
Dependent Claim
124 words
An electro-magnetic power generator for use inside a vehicular tire and the like, comprising a core having a coil wound around at least a portion thereof; a movable bar normally closing a magnetic circuit through said core; one of said core or movable bar being permanently magnetized, and a flexible restraining member constrained to follow movement of the inner tire periphery, holding with one of its portions said movable member and holding said core with another of its portions, intermittently to move the movable member away from said core during rotation of the tire when the same slightly flattens upon contact with the ground, whereupon magnetic attraction pulls back said bar to said core, and a small electromotive force is induced in said coil.
Claim 3
Dependent Claim
13 words
The power generator as defined in claim 1, wherein the core is U-shaped.
Claim 4
Dependent Claim
49 words
The power generator as defined in claim 1 or 2, wherein the main directions of said movable bar and said restraining member are substantially perpendicular, that of said restraining member substantially coinciding with a circumferential portion on the inner periphery of the tire, where said restraining member is secured.
Claim 5
Dependent Claim
35 words
The power generator as defined in claim 1, comprising electrical storage means for the small voltages and currents induced in said coil, and voltage limiting means connected parallel with the output of the power generator.
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) | 1983-09-02 | 1984-03-03 | 1984-09-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-09-02 | 1988-03-03 | 1988-09-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-09-02 | 1992-03-03 | 1992-09-02 | $7700.00 | Window Closed / Lapsed |