Patent US2804404A successfully refreshed from Google Patents.
US2804404A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of impregnating electrical windings
Assignee: Motors Liquidation Co
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Filing: 1955-10-04
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Granted: 1957-08-27
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Expires: 1975-10-04
Abstract
No abstract record available.
Inventors
- 👤 Elmer E Thiessen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 14:20
CPC Classifications
H; H02; H02K; H02K15/00; H02K15/12
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
155 words
THE METHOD OF TREATING AN ELECTRICAL WINDING WITHH VARNISHED COMPRISING THE STEPS OF IMMERSING SAID WINDING IN A BATH OF VARNISH TINNED WITH A SOLVENT CONTAINING A SUBSTANTIAL PORTION OF HIGH BOILING CONSTITUENT AND AT SUBSTANTIAL POSRTION OF LOW BOILING CONSTITUENT WHILE SAID WINDING IS UNIFORMLY HEATED TO A TEMPERATURE AT LEAST HIGHER THAN THE BOILING POINT OF SAID LOW BOILING CONSTITUENT, ALLOWING SAID WINDING TO REMAIN IN SAID BATH UNTIL SAID WINDING IS IMPREGNATED WITH SAID VARNISHED AND UNTIL A SUBSTANTIAL PROPORTION OF SAID LOW BOILING CONSTITUENT IS VOLATILIZED BY THE INTRINSIC HEAT ENERGY OF SAID WINDING SEPARATING THE WINDING FROM THE BATH, THEREAFTER REMOVING THE REMAINING SOLVENT IN SAID WINDING SUFFIWINDING BY REDUCING THE PRESSURE ON SAID WINDING SUFFICIENTLY TO ALLOW THE INTRINSIC HEAT ENERGY REMAINING IN SAID WINDING TO VOLATILIZE THE REMAINING LOW BOILING CONSTITUENT AND SUBSTANTIALLY ALL OF THE HIGH BOILING CONSTITUENT AND THEREAFTER HEATING SAID WINDING TO CURE SAID VARNISH.
Claim 2
Independent Claim
155 words
THE METHOD OF TREATING AN ELECTRICAL WINDING WITHH VARNISHED COMPRISING THE STEPS OF IMMERSING SAID WINDING IN A BATH OF VARNISH TINNED WITH A SOLVENT CONTAINING A SUBSTANTIAL PORTION OF HIGH BOILING CONSTITUENT AND AT SUBSTANTIAL POSRTION OF LOW BOILING CONSTITUENT WHILE SAID WINDING IS UNIFORMLY HEATED TO A TEMPERATURE AT LEAST HIGHER THAN THE BOILING POINT OF SAID LOW BOILING CONSTITUENT, ALLOWING SAID WINDING TO REMAIN IN SAID BATH UNTIL SAID WINDING IS IMPREGNATED WITH SAID VARNISHED AND UNTIL A SUBSTANTIAL PROPORTION OF SAID LOW BOILING CONSTITUENT IS VOLATILIZED BY THE INTRINSIC HEAT ENERGY OF SAID WINDING SEPARATING THE WINDING FROM THE BATH, THEREAFTER REMOVING THE REMAINING SOLVENT IN SAID WINDING SUFFIWINDING BY REDUCING THE PRESSURE ON SAID WINDING SUFFICIENTLY TO ALLOW THE INTRINSIC HEAT ENERGY REMAINING IN SAID WINDING TO VOLATILIZE THE REMAINING LOW BOILING CONSTITUENT AND SUBSTANTIALLY ALL OF THE HIGH BOILING CONSTITUENT AND THEREAFTER HEATING SAID WINDING TO CURE SAID VARNISH.
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) | 1960-08-26 | 1961-02-25 | 1961-08-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-08-26 | 1965-02-25 | 1965-08-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-08-26 | 1969-02-25 | 1969-08-27 | $7700.00 | Window Closed / Lapsed |