US3122894A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hermetic motor cooling by direct expansion of system refrigerant into motor
Assignee: American Radiator and Standard Sanitary Corp
•
Filing: 1962-07-05
•
Granted: 1964-03-03
•
Expires: 1982-07-05
Abstract
No abstract record available.
Inventors
- 👤 Richard L Bernhard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 11:30
CPC Classifications
H; H02; H02K; H02K9/00; H02K9/19; H02K9/20; F; F25; F25B; F25B31/00; F25B31/006; F25B31/008
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
64 words
IN A METHOD OF COOLING AN ELECTRIC MACHINE HAVING A ROTOR AND STATOR SEPARATED BY AN ANNULAR GAP HAVING TWO OPEN ENDS, THE STEPS OF FEEDING VAPORIZABLE LIQUID REFRIGERANT DIRECTLY INTO THE TWO ENDS OF THE GAP, REDUCING THE PRESSURE WITHIN THE GAP TO SIMULTANEOUSLY EVAPORATE AT LEAST PART OF THE LIQUID REFRIGERANT WITHIN THE GAP AND WITHDRAW THE EVAPORATED REFRIGERANT FROM THE GAP.
Claim 2
Dependent Claim
64 words
IN A METHOD OF COOLING AN ELECTRIC MACHINE HAVING A ROTOR AND STATOR SEPARATED BY AN ANNULAR GAP HAVING TWO OPEN ENDS, THE STEPS OF FEEDING VAPORIZABLE LIQUID REFRIGERANT DIRECTLY INTO THE TWO ENDS OF THE GAP, REDUCING THE PRESSURE WITHIN THE GAP TO SIMULTANEOUSLY EVAPORATE AT LEAST PART OF THE LIQUID REFRIGERANT WITHIN THE GAP AND WITHDRAW THE EVAPORATED REFRIGERANT FROM THE GAP.
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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) | 1967-03-03 | 1967-09-02 | 1968-03-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-03-03 | 1971-09-02 | 1972-03-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-03-03 | 1975-09-02 | 1976-03-03 | $7700.00 | Window Closed / Lapsed |