US3221195A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Core for dynamoelectric machines
Assignee: Allis Chalmers Corp
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Filing: 1961-11-24
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Granted: 1965-11-30
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Expires: 1981-11-24
Abstract
No abstract record available.
Inventors
- 👤 Jack H Hoffmann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:55
CPC Classifications
H; H02; H02K; H02K1/00; H02K1/06; H02K1/12; H02K1/16
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
137 words
A CORE FOR A DYNAMOELECTRIC MACHINE COMPRISING: A PLURALITY OF SUBSTANTIALLY TRAPEOZIODAL SHAPED LAMINATIONS HAVING A SLOTS AT THEIR INNER END, SAID LAMINATIONS BEING COMBINED TO FORM ANNULAR LAMINATION RINGS, SAID LAMINATION RINGS BEING ALIGNED AND STACKED, SECONDARY LAMINATIONS OF SUBSTANTIALLY TRAPEZOIDAL SHAPE HAVING A RADIAL LENGTH LESS THAN THE DISTANCE BETWEEN THE OUTER EDGE AND BOTTOM OF SAID SLOTS IN SAID PRIMARY LAMINATIONS, SAID SECONDARY LAMINATIONS BEING COMBINED TO FORM ANNULAR LAMINATION RINGS AND BING INTERSPERED WITH SAID PRIMARY LAMINATION RINGS, TERITARY LAMINATIONS OF SUBSTANTIALLY TRAPEXOIDAL SHAPE HAVING A RADIAL LENGTH LESS THAN THE RADIAL LENGTH OF SAID SECONDARY LAMINATIONS, SAID TERTIARY LAMINATIONS BEING COMBINED TO FORM ANNUALAR LAMINATION RINGS INTERSPERSED WITH THE OTHER SAID LAMINATION RINGS, SAID LAMINATIONS BEING CLAMPED TOGETHER TO FORM A CORE FOR A DYNAMEOLECTRIC MACHINE HAVING A SUBSTANTIALLY UNIFORM OVERALL LENGTH.
References Cited (Backward Citations)
US1538196A
Cited
US1816795A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-11-29 | 1969-05-31 | 1969-11-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-11-29 | 1973-05-31 | 1973-11-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-11-29 | 1977-05-31 | 1977-11-30 | $7700.00 | Window Closed / Lapsed |