Patent US3428838A successfully refreshed from Google Patents.
US3428838A
Expired / Lapsed
US
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Wear detector for fluid-cooled electric machine
Assignee: General Electric Co
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Filing: 1966-09-15
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Granted: 1969-02-18
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Expires: 1986-09-15
Abstract
No abstract record available.
Inventors
- 👤 Chester C Carson
- 👤 Edward E Gibbs
- 👤 Lloyd P Grobel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 10:35
CPC Classifications
G; G01; G01R; G01R31/00; G01R31/34; G01R31/343
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
127 words
IN AN ELECTRIC MACHINE HAVING A PAIR OF ADJACENT PARTS THEREIN SUBJECT TO CYCLIC FORCES DURING OPERATION OF THE MACHINE TENDING TO PRODUCE RELATIVE MOTION THEREBETWEEN, ONE OF SAID PARTS SERVING TO INSULATE THE WINDINGS OF THE MACHINE, MEANS CIRCULATING FLUID COOLANT THROUGH THE MACHINE AND OVER THE PARTS, ONE OF SAID PARTS INCLUDING THE LAYER OF MATERIAL SUBSTANTIALLY NONCONTRIBUTIVE TO THE PRIMARY FUNCTION OF THE PART AND HAVING PHYSICAL ATTRIBUTES DISTINGUISHABLE FROM THE MATERIAL OF THE INSULATING PARTS, SAID LAYER BEING DISPOSED AT THE LOCATION WHERE THE PARTS TOUCH ONE ANOTHER, MEANS WITHDRAWING A TEST PORTION OF THE FLUID COOLANT FROM THE MACHINE, AND DETECTOR MEANS ARRANGED TO PROVIDE AN INDICATION EXTERNAL TO THE MACHINE WHEN MATERIAL FROM SAID LAYER IS PRESENT IN THE FLUID COOLANT.
Claim 2
Dependent Claim
127 words
IN AN ELECTRIC MACHINE HAVING A PAIR OF ADJACENT PARTS THEREIN SUBJECT TO CYCLIC FORCES DURING OPERATION OF THE MACHINE TENDING TO PRODUCE RELATIVE MOTION THEREBETWEEN, ONE OF SAID PARTS SERVING TO INSULATE THE WINDINGS OF THE MACHINE, MEANS CIRCULATING FLUID COOLANT THROUGH THE MACHINE AND OVER THE PARTS, ONE OF SAID PARTS INCLUDING THE LAYER OF MATERIAL SUBSTANTIALLY NONCONTRIBUTIVE TO THE PRIMARY FUNCTION OF THE PART AND HAVING PHYSICAL ATTRIBUTES DISTINGUISHABLE FROM THE MATERIAL OF THE INSULATING PARTS, SAID LAYER BEING DISPOSED AT THE LOCATION WHERE THE PARTS TOUCH ONE ANOTHER, MEANS WITHDRAWING A TEST PORTION OF THE FLUID COOLANT FROM THE MACHINE, AND DETECTOR MEANS ARRANGED TO PROVIDE AN INDICATION EXTERNAL TO THE MACHINE WHEN MATERIAL FROM SAID LAYER IS PRESENT IN THE FLUID COOLANT.
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) | 1972-02-18 | 1972-08-19 | 1973-02-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-02-18 | 1976-08-19 | 1977-02-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-02-18 | 1980-08-19 | 1981-02-18 | $7700.00 | Window Closed / Lapsed |