Patent US3240967A successfully refreshed from Google Patents.
US3240967A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cooling arrangement for electric machines
Assignee: Individual
•
Filing: 1959-07-31
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Granted: 1966-03-15
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Expires: 1979-07-31
Abstract
No abstract record available.
Inventors
- 👤 Krastchew Christoslaw
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 12:55
CPC Classifications
H; H02; H02K; H02K9/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
128 words
A DYNAMOELECTRIC MACHINE COMPRISING INTERNALLY LIQUID COOLED ROTOR AND STATOR WINDINGS AND CORES, THE INTERNALLY LIQUID COOLED ROTOR AND STATOR BEING COAXIAL WITH EACH OTHER AND DEFINING THEREBETWEEN AN AIR GAP, AND BEING ENCLOSED IN A MACHINE HOUSING, SAID MACHINE HOUSING BEING VACUUM-TIGHTLY BUILT AND SEALED OFF FROM THE OUTER ATMOSPHERE; AND PUMPING MEANS COMMUNICATING WITH THE INTERIOR OF SAID MACHINE HOUSING AND OPERATING DURING THE OPERATION OF SAID MACHINE FOR EVACUATING THE AIR AND VAPORS AND FOR MAINTAINING IN THE INTERIOR OF SAID MACHINE HOUSING A STATIC AIR PRESSURE SUBSTANTIALLY LESS THAN ATMOSPHERIC PRESSURE FOR REDUCING THE WINDAGE LOSSES OF THE INTERNALLY LIQUID COOLED ROTOR OF SAID DYNAMOELECTRIC MACHINE, AND FOR REMOVING VAPORS RESULTING FROM LEAKAGE OF LIQUID FROM SAID LIQUID-COOLED ROTOR AND STATOR WINDINGS AND CORES.
Claim 2
Dependent Claim
128 words
A DYNAMOELECTRIC MACHINE COMPRISING INTERNALLY LIQUID COOLED ROTOR AND STATOR WINDINGS AND CORES, THE INTERNALLY LIQUID COOLED ROTOR AND STATOR BEING COAXIAL WITH EACH OTHER AND DEFINING THEREBETWEEN AN AIR GAP, AND BEING ENCLOSED IN A MACHINE HOUSING, SAID MACHINE HOUSING BEING VACUUM-TIGHTLY BUILT AND SEALED OFF FROM THE OUTER ATMOSPHERE; AND PUMPING MEANS COMMUNICATING WITH THE INTERIOR OF SAID MACHINE HOUSING AND OPERATING DURING THE OPERATION OF SAID MACHINE FOR EVACUATING THE AIR AND VAPORS AND FOR MAINTAINING IN THE INTERIOR OF SAID MACHINE HOUSING A STATIC AIR PRESSURE SUBSTANTIALLY LESS THAN ATMOSPHERIC PRESSURE FOR REDUCING THE WINDAGE LOSSES OF THE INTERNALLY LIQUID COOLED ROTOR OF SAID DYNAMOELECTRIC MACHINE, AND FOR REMOVING VAPORS RESULTING FROM LEAKAGE OF LIQUID FROM SAID LIQUID-COOLED ROTOR AND STATOR WINDINGS AND CORES.
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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) | 1969-03-14 | 1969-09-13 | 1970-03-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-03-14 | 1973-09-13 | 1974-03-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-03-14 | 1977-09-13 | 1978-03-15 | $7700.00 | Window Closed / Lapsed |