US2554250A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Insulating compositions for laminations and product produced therewith
Assignee: Westinghouse Electric Corp
•
Filing: 1947-12-11
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Granted: 1951-05-22
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Expires: 1967-12-11
Abstract
No abstract record available.
Inventors
- 👤 Clifford C Horstman
- 👤 Fritz J Nagel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 19:09
CPC Classifications
C; C23; C23C; C23C22/00; C23C22/73; C23C22/74; H; H01; H01F; H01F1/00; H01F1/01; H01F1/03; H01F1/12; H01F1/14; H01F1/16; H01F1/20; H01F1/22; H01F1/24; Y; Y10; Y10T; Y10T428/00; Y10T428/27; Y10T428/273
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
171 words
IN THE PROCESS OF TREATING FERROUS METAL TO PROVIDE ON THE SURFACE THEREOF A TENACIOUSLY ADHERENT FILM OF HIGH OHMIC RESISTANCE, THE STEPS COMPRISING APPLYING TO THE SURFACE OF THE FERROUS METAL A COMPOSITION COMPOSED OF 100 PARTS BY WEIGHT OF ORTHOPHOSPHORIC ACID, FROM 5 TO 55 PARTS BY WEIGHT OF A SILICA HYDROGEL COMPOSED OF PARTICLES SUBSTANTIALLY ALL OF WHICH ARE IN THE RANGE OF FROM 1 TO 20 MICRONS IN DIAMETER, AND FROM 7 TO NOT MORE THAN 15 PARTS BY WEIGHT OF WATER FOR EACH PART OF THE SILICA HYDROGEL, THE MAXIMUM AMOUNT OF WATER NOT EXCEEDING 600 PARTS BY WEIGHT, THE COMPOSITION BEING APPLIED TO PROVIDE FROM 1/2 TO 5 POUNDS OF THE SILICA IN THE HYDROGEL FOR EACH 300 SQUARE FEET OF METAL SURFACE, AND HEAT-TREATING THE FERROUS METAL AND APPLIED COMPOSITION AT A TEMPERATURE OF FROM 300* C. TO 950* C. TO DRIVE OFF THE WATER AND CAUSE A REACTION OF THE COMPOSITION WITH THE FERROUS METAL TO TAKE PLACE TO PROVIDE THE ADHERENT FILM.
References Cited (Backward Citations)
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US1850726A
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US2030601A
Cited
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Cited
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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) | 1954-05-21 | 1954-11-20 | 1955-05-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-05-21 | 1958-11-20 | 1959-05-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-05-21 | 1962-11-20 | 1963-05-22 | $7700.00 | Window Closed / Lapsed |