US3671335A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Non-reactive refractory separating coatings for electrical steels
Assignee: Westinghouse Electric Corp
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Filing: 1970-03-25
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Granted: 1972-06-20
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Expires: 1990-03-25
Abstract
Abstract AN AQUEOUS SLSURRY COMPRISING ABOUT 60% BY WEIGHT OF AL2O3, BASED ON THE WEIGHT OF THE WATER, AND SMALL AMOUNTS OF POLYVINYL ALCOHOL AND AN ORGANIC SUSPENDING AGENT (MORE PARTICULARLY, A CELLULOSIC SUSPENDING AGENT), IS APPLIED TO ELECTRICAL SHEET STEEL AND DRIED THEREON TO PROVIDE A RELATIVELY THIN AND UNIFORM SEPARATING COATING. A PLURALITY OF SUCH COATED SHEETS MAY BE STACKED OR A SINGLE SUCH SHEET MAY BE COILED FOR FINAL ANNEALING AT ELEVATED TEMPERATURE.
Inventors
- 👤 Norman M Pavlik
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 09:56
CPC Classifications
H; H01; H01F; H01F1/00; H01F1/01; H01F1/03; H01F1/12; H01F1/14; H01F1/147; H01F1/14766; H01F1/14775; H01F1/14783; C; C21; C21D; C21D1/00; C21D1/68; C21D1/70; C23; C23D; C23D5/00; C23D5/10
Claims Analysis
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References Cited (Backward Citations)
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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) | 1975-06-20 | 1975-12-20 | 1976-06-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-20 | 1979-12-20 | 1980-06-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-20 | 1983-12-20 | 1984-06-20 | $7700.00 | Window Closed / Lapsed |