US2663808A
Expired / Lapsed
US
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Dynamoelectric machine having a ventilation shield in the air gap
Assignee: Allis Chalmers Corp
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Filing: 1952-06-20
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Granted: 1953-12-22
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Expires: 1972-06-20
Abstract
No abstract record available.
Inventors
- 👤 Leon T Rosenberg
- 👤 John L Kuehlthau
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 14:21
CPC Classifications
H; H02; H02K; H02K3/00; H02K3/04; H02K3/24; H02K9/00
Claims Analysis
Total Claims: 0
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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) | 1956-12-21 | 1957-06-22 | 1957-12-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-12-21 | 1961-06-22 | 1961-12-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-12-21 | 1965-06-22 | 1965-12-22 | $7700.00 | Window Closed / Lapsed |