US3657582A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rotor annulus for electric generator
Assignee: Individual
•
Filing: 1970-10-29
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Granted: 1972-04-18
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Expires: 1990-10-29
Abstract
Abstract A rotor annulus for an electric generator comprising an annular ring of magnetic members including permanent magnets and pole pieces arranged in respective end-to-end and circumaxial alternate series. A circular spring band surrounds the ring of members in pressing engagement with at least some of the members to hold all of the elements of the annulus in substantially fixed relationship with each other.
Inventors
- 👤 Russell E Phelon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 05:50
CPC Classifications
H; H02; H02K; H02K1/00; H02K1/06; H02K1/22; H02K1/27; H02K1/2786; H02K1/2787; H02K1/2789; H02K1/2791
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
105 words
An annulus for the rotor of an electric generator, which annulus has a large central opening and comprises in combination: an annular series of magnetic members which series includes an annular arrangement of permanent magnets and also includes an annular arrangement of pole pieces respectively engaging the magnets and located with their interfaces approximately tangent to a cylindrical surface having the diameter of said large central opening, and a generally circular circumferentially expandable coil spring surrounding said magnetic members and in pressure engagement with at least some of said members holding all of the elements of the annulus in substantially fixed relationship with each other.
Claim 2
Dependent Claim
105 words
An annulus for the rotor of an electric generator, which annulus has a large central opening and comprises in combination: an annular series of magnetic members which series includes an annular arrangement of permanent magnets and also includes an annular arrangement of pole pieces respectively engaging the magnets and located with their interfaces approximately tangent to a cylindrical surface having the diameter of said large central opening, and a generally circular circumferentially expandable coil spring surrounding said magnetic members and in pressure engagement with at least some of said members holding all of the elements of the annulus in substantially fixed relationship with each other.
Claim 3
Dependent Claim
24 words
An annulus for the rotor of an electric generator as set forth in claim 1 wherein said coil spring is made of magnetic material.
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) | 1975-04-18 | 1975-10-18 | 1976-04-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-04-18 | 1979-10-18 | 1980-04-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-04-18 | 1983-10-18 | 1984-04-18 | $7700.00 | Window Closed / Lapsed |