US2920218A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Supercharged dynamoelectric machine with cooling gas in contact with conductors
Assignee: Allis Chalmers Corp
•
Filing: 1951-08-23
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Granted: 1960-01-05
•
Expires: 1971-08-23
Abstract
No abstract record available.
Inventors
- 👤 Sterling Beckwith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 04:50
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)
US1170192A
Cited
FR714319A
Cited
DE603961C
Cited
GB380067A
Cited
US2221567A
Cited
US2451219A
Cited
US2573670A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-01-04 | 1963-07-06 | 1964-01-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-01-04 | 1967-07-06 | 1968-01-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-01-04 | 1971-07-06 | 1972-01-05 | $7700.00 | Window Closed / Lapsed |