Patent US2501349A successfully refreshed from Google Patents.
US2501349A
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US
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Insulation for magnetic material
Assignee: Westinghouse Electric Corp
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Filing: 1946-05-10
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Granted: 1950-03-21
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Expires: 1966-05-10
Abstract
No abstract record available.
Inventors
- 👤 Fritz J Nagel
- 👤 Clifford C Horstman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 03:22
CPC Classifications
C; C23; C23C; C23C22/00; C23C22/73; C23C22/74; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/4902; Y10T29/49075; Y10T29/49078; Y10T428/00; Y10T428/26; Y10T428/263; Y10T428/264; Y10T428/265
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
76 words
IN THE PROCESS OF PROVIDING A TENACIOUSLY ADHERENT FILM POSSESING HIGH OHMIC RESISTANCE ON THE SURFACES OF FERROUS METAL, THE STEPS COMPRISING APPLYING TO THE SURFACE OF THE FERROUS METAL AN AQUOUS COMPOSITION OF FROM 1% TO 30% BY WEIGHT OF AT LEAST ONE INORGANIC ACID SELECTED FROM THE GROUP CONSISTING OF SILICOTUNGSTIC AND PHOSPHOTUNGSTIC ACIDS, FROM 19% TO 50% BY WEIGHT OF PHOSPHORIC ACID, AND THE BALANCE WATER, AND HEAT-TREATING THE FERROUS METAL AND APPLIED
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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) | 1953-03-20 | 1953-09-19 | 1954-03-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-03-20 | 1957-09-19 | 1958-03-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-03-20 | 1961-09-19 | 1962-03-21 | $7700.00 | Window Closed / Lapsed |