Patent US2707156A successfully refreshed from Google Patents.
US2707156A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of impregnating electrical induction apparatus
Assignee: McGraw Electric Co
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Filing: 1951-04-27
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Granted: 1955-04-26
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Expires: 1971-04-27
Abstract
No abstract record available.
Inventors
- 👤 Martin I Zwelling
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 20:27
CPC Classifications
H; H01; H01F; H01F27/00; H01F27/28; H01F27/32; H01F27/327; H01F41/00; H01F41/02; H01F41/04; H01F41/12; H01F41/127
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
115 words
THE PROCESS OF IMPREGNATING A POROUS CONDUCTIVE COIL FOR AN ELECTRICAL INDUCTION APPARATUS, SAID COIL HAVING OUTER AND INNER WINDINGS, WHICH CONSISTS IN IMMERSING SAID COIL CONTAINING OCCLUDED MOISTURE IN A HEAT-REACTIVE VARNISH MIXTURE CONTAINING VOLATILE VARNISH SOLVENTS FOR A TIME SUFFICIENT TO IMPREGNATE ONLY THE OUTER WINDINGS WITH A VARNISH LAYER, REMOVING AND DRAINING SAID COIL FROM SAID MIXTURE, HEAT CURING SAID VARNISHED COIL TO EVAPORATE SAID VOLATILE SOLVENTS FROM SAID VARNISH LAYER TO LEAVE VOID SPACES THEREIN, TO EVAPORATE SAID OCCLUDED MOISTURE FROM SAID COIL THROUGH SAID VOID SPACES, AND TO PROVIDE SAID VARNISH LAYER WITH A NON-BRITTLE TEXTURE; AND IMPREGSAID VARNISH LAYER AND THE INTERSTICES OF THE INNER WINDINGS OF SAID COIL.
Claim 2
Dependent Claim
115 words
THE PROCESS OF IMPREGNATING A POROUS CONDUCTIVE COIL FOR AN ELECTRICAL INDUCTION APPARATUS, SAID COIL HAVING OUTER AND INNER WINDINGS, WHICH CONSISTS IN IMMERSING SAID COIL CONTAINING OCCLUDED MOISTURE IN A HEAT-REACTIVE VARNISH MIXTURE CONTAINING VOLATILE VARNISH SOLVENTS FOR A TIME SUFFICIENT TO IMPREGNATE ONLY THE OUTER WINDINGS WITH A VARNISH LAYER, REMOVING AND DRAINING SAID COIL FROM SAID MIXTURE, HEAT CURING SAID VARNISHED COIL TO EVAPORATE SAID VOLATILE SOLVENTS FROM SAID VARNISH LAYER TO LEAVE VOID SPACES THEREIN, TO EVAPORATE SAID OCCLUDED MOISTURE FROM SAID COIL THROUGH SAID VOID SPACES, AND TO PROVIDE SAID VARNISH LAYER WITH A NON-BRITTLE TEXTURE; AND IMPREGSAID VARNISH LAYER AND THE INTERSTICES OF THE INNER WINDINGS OF SAID COIL.
References Cited (Backward Citations)
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US2246159A
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US2346934A
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US2365427A
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US2549309A
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US2459018A
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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) | 1958-04-25 | 1958-10-25 | 1959-04-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-04-25 | 1962-10-25 | 1963-04-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-04-25 | 1966-10-25 | 1967-04-26 | $7700.00 | Window Closed / Lapsed |