US2904875A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of coating magnetic sheet material
Assignee: Westinghouse Electric Corp
•
Filing: 1954-08-26
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Granted: 1959-09-22
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Expires: 1974-08-26
Abstract
No abstract record available.
Inventors
- 👤 Warren M Trigg
- 👤 Byron V Mcbride
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 08:09
CPC Classifications
H; H01; H01F; H01F1/00; H01F1/01; H01F1/03; H01F1/12; H01F1/14; H01F1/16; H01F1/18; Y; Y10; Y10S; Y10S428/00; Y10S428/90; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/4902; Y10T29/49075; Y10T29/49078
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
142 words
IN THE METHOD OF FORMING MAGNETIC CORES, THE STEPS COMPRISING APPLYING TO MAGNETIC SHEET MATERIAL A LAYER OF AN AQUEOUS COMPOSITION CONSISTING ESSENTIALLY OF FROM 5% TO 15% BY WEIGHT OF AT LEAST ONE AMINOTRIAZINE-ALDEHYDE RESIN, FROM 5% TO 15% BY WEIGHT OF MAGNESIUM HYDROXIDE, FROM 0.1% TO 1% BY WEIGHT OF BENTONITE, FROM 30% TO 50% BY WEIGHT OF AT LEAST ONE LOW MOLECULAR WEIGHT ALIPHATIC MONOHYDRIC ALCOHOL, AND FROM 30% TO 50% BY WEIGHT OF WATER, HEATING THE APPLIED LAYER TO A TEMPERATURE OF ABOUT 150*C. TO DRIVE OFF THE WATER AND ALCOHOL AND CURE THE RESIN, SUPERIMPOSING A PLURALITY OF SHEETS OF SAID COATED MAGNETIC MATERIAL, AND HEATING THE SUPERIMPOSED SHEETS AT A TEMPERATURE 900*C. IN A REDUCING ATMOSPHERE TO DRIVE OFF THE RESIN WHEREBY AN ELECTRICAL INSULATING COATING OF MAGNESIUM OXIDE AND BENTONITE IS LEFT BETWEEN THE SHEETS.
Claim 2
Dependent Claim
142 words
IN THE METHOD OF FORMING MAGNETIC CORES, THE STEPS COMPRISING APPLYING TO MAGNETIC SHEET MATERIAL A LAYER OF AN AQUEOUS COMPOSITION CONSISTING ESSENTIALLY OF FROM 5% TO 15% BY WEIGHT OF AT LEAST ONE AMINOTRIAZINE-ALDEHYDE RESIN, FROM 5% TO 15% BY WEIGHT OF MAGNESIUM HYDROXIDE, FROM 0.1% TO 1% BY WEIGHT OF BENTONITE, FROM 30% TO 50% BY WEIGHT OF AT LEAST ONE LOW MOLECULAR WEIGHT ALIPHATIC MONOHYDRIC ALCOHOL, AND FROM 30% TO 50% BY WEIGHT OF WATER, HEATING THE APPLIED LAYER TO A TEMPERATURE OF ABOUT 150*C. TO DRIVE OFF THE WATER AND ALCOHOL AND CURE THE RESIN, SUPERIMPOSING A PLURALITY OF SHEETS OF SAID COATED MAGNETIC MATERIAL, AND HEATING THE SUPERIMPOSED SHEETS AT A TEMPERATURE 900*C. IN A REDUCING ATMOSPHERE TO DRIVE OFF THE RESIN WHEREBY AN ELECTRICAL INSULATING COATING OF MAGNESIUM OXIDE AND BENTONITE IS LEFT BETWEEN THE SHEETS.
References Cited (Backward Citations)
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US2465284A
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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) | 1962-09-21 | 1963-03-23 | 1963-09-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-09-21 | 1967-03-23 | 1967-09-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-09-21 | 1971-03-23 | 1971-09-22 | $7700.00 | Window Closed / Lapsed |