Patent US3171996A successfully refreshed from Google Patents.
US3171996A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stator air duct design
Assignee: General Electric Co
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Filing: 1960-01-07
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Granted: 1965-03-02
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Expires: 1980-01-07
Abstract
No abstract record available.
Inventors
- 👤 Philip L Alger
- 👤 Robert L Wall
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 03:23
CPC Classifications
H; H02; H02K; H02K1/00; H02K1/06; H02K1/12; H02K1/20
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
148 words
A LOW NOISE MOTOR COMPRISING A FRAME ENCLOSING A STATOR AND A RATOR, EACH INCLUDING A MAGNETIC CORE HAVING CONDUCTOR BARS COMPRISING A WINDING AND RADIALLY DISPOSED AIR DUCTS THEREIN, SAID RATOR INCLUDING A LESS NUMBER OF BARS CROSSING SAID AIR DUCTS THAN THE NUMBER OF CONUDUCTOR BARS IN THE RATOR, THEREBY TO PROVIDE AIR PRESSURE PULSATIONS OF A PREDETERMINED FREQUENCY WHEN THE ROTOR IS OPERATED IN THE STATOR, SAID STATOR INCLUDING SPACE BLOCKS FOR FORMING THE STATOR AIR DUCTS, SAID SPACE BLOCKS BEING LOCATED ON EACH OF THE STATOR CORE TEETH AND EXTENDING OUTWARDLY A DISTANCE SUFFICIENT TO CAUSE EACH DUCT TO HAVE A WAVELENGTH OF AT LEAST 30* AWAY FROM RESONANCE ON EITHER SIDE SO THAT DURING OPERATION THE PRESSURE PULSATIONS CAUSE THE MASS OF AIR IN THE AIR DUCTS TO PULSATE AT A FREQUENCY HAVING A WAVELENGTH DIFFERENT THAN THE WAVELENGTH OF THE STATOR DUCTS.
Claim 2
Dependent Claim
148 words
A LOW NOISE MOTOR COMPRISING A FRAME ENCLOSING A STATOR AND A RATOR, EACH INCLUDING A MAGNETIC CORE HAVING CONDUCTOR BARS COMPRISING A WINDING AND RADIALLY DISPOSED AIR DUCTS THEREIN, SAID RATOR INCLUDING A LESS NUMBER OF BARS CROSSING SAID AIR DUCTS THAN THE NUMBER OF CONUDUCTOR BARS IN THE RATOR, THEREBY TO PROVIDE AIR PRESSURE PULSATIONS OF A PREDETERMINED FREQUENCY WHEN THE ROTOR IS OPERATED IN THE STATOR, SAID STATOR INCLUDING SPACE BLOCKS FOR FORMING THE STATOR AIR DUCTS, SAID SPACE BLOCKS BEING LOCATED ON EACH OF THE STATOR CORE TEETH AND EXTENDING OUTWARDLY A DISTANCE SUFFICIENT TO CAUSE EACH DUCT TO HAVE A WAVELENGTH OF AT LEAST 30* AWAY FROM RESONANCE ON EITHER SIDE SO THAT DURING OPERATION THE PRESSURE PULSATIONS CAUSE THE MASS OF AIR IN THE AIR DUCTS TO PULSATE AT A FREQUENCY HAVING A WAVELENGTH DIFFERENT THAN THE WAVELENGTH OF THE STATOR DUCTS.
References Cited (Backward Citations)
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US933737A
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US1022021A
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US1196345A
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US1913138A
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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) | 1968-03-01 | 1968-08-31 | 1969-03-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-03-01 | 1972-08-31 | 1973-03-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-03-01 | 1976-08-31 | 1977-03-02 | $7700.00 | Window Closed / Lapsed |