US3139545A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electric motor with permanent magnet field and reciprocable coil
Assignee: Individual
•
Filing: 1959-03-03
•
Granted: 1964-06-30
•
Expires: 1979-03-03
Abstract
No abstract record available.
Inventors
- 👤 Dreyfus Jean Albert
- 👤 Murbach Andreas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 01:18
CPC Classifications
H; H01; H01H; H01H53/00; H01H53/01; H01H53/015; H04; H04R; H04R9/00; H04R9/02; H04R9/025; H04R2209/00; H04R2209/022
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
143 words
IN AN ELECTRIC MOTOR; A BAR OF MAGNETIC MATERIAL, THREE PERMANENT MAGNETS IN SPACED PARALLEL COPLANAR RELATION ON SAID BAR, THE INTERMEDIATE ONE OF SAID MAGNETS BEING SHORTER THAN THE OTHER MAGNETS, A SOFT IRON POLE PIECE ON THE END OF SAID INTERMEDIATE MAGNETS PROJECTING OUTWARDLY THEREFROM BEYOND THE ENDS OF THE TWO OUTER MAGNETS, A SOFT IRON MEMBER EXTENDING BETWEEN THE OUTER ENDS OF SAID TWO OUTER MAGNETS AND HAVING AN APERTURE RECEIVING THE END OF SAID POLE PIECE, A COIL, AND MEANS MOVABLY SUSPENDING THE COIL IN THE GAP FORMED BETWEEN THE PERIPHERY OF SAID APERTURE AND SAID SOFT IRON POLE PIECE, SAID INTERMEDIATE MAGNET BEING SUBSTANTIALLY EQUAL IN CROSS SECTIONAL AREA TO THE SUM OF THE AREAS OF THE TWO OUTER MAGNETS, AND ALL OF SAID MAGNETS TAPERING INWARDLY FROM THE SAID BAR TOWARD THE OUTER ENDS OF SAID MAGNETS.
Claim 2
Dependent Claim
143 words
IN AN ELECTRIC MOTOR; A BAR OF MAGNETIC MATERIAL, THREE PERMANENT MAGNETS IN SPACED PARALLEL COPLANAR RELATION ON SAID BAR, THE INTERMEDIATE ONE OF SAID MAGNETS BEING SHORTER THAN THE OTHER MAGNETS, A SOFT IRON POLE PIECE ON THE END OF SAID INTERMEDIATE MAGNETS PROJECTING OUTWARDLY THEREFROM BEYOND THE ENDS OF THE TWO OUTER MAGNETS, A SOFT IRON MEMBER EXTENDING BETWEEN THE OUTER ENDS OF SAID TWO OUTER MAGNETS AND HAVING AN APERTURE RECEIVING THE END OF SAID POLE PIECE, A COIL, AND MEANS MOVABLY SUSPENDING THE COIL IN THE GAP FORMED BETWEEN THE PERIPHERY OF SAID APERTURE AND SAID SOFT IRON POLE PIECE, SAID INTERMEDIATE MAGNET BEING SUBSTANTIALLY EQUAL IN CROSS SECTIONAL AREA TO THE SUM OF THE AREAS OF THE TWO OUTER MAGNETS, AND ALL OF SAID MAGNETS TAPERING INWARDLY FROM THE SAID BAR TOWARD THE OUTER ENDS OF SAID MAGNETS.
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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) | 1967-06-30 | 1967-12-30 | 1968-06-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-06-30 | 1971-12-30 | 1972-06-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-06-30 | 1975-12-30 | 1976-06-30 | $7700.00 | Window Closed / Lapsed |