US3634559A
Expired / Lapsed
US
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Method for manufacturing ceramic magnetic articles
Assignee: US Philips Corp
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Filing: 1969-08-22
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Granted: 1972-01-11
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Expires: 1989-08-22
Abstract
Abstract A METHOD FOR MOLDING CERAMIC MAGNETIC ARTICLES, PARTICULARLY STATORS FOR SMALL ELECTRIC MOTORS, WHICH PROVIDES ARTICLES POSSESSING A UNIFORM DENSITY AND A UNIFORM MAGNETIC FIELD. A CERAMIC MASS SUSPENSION IS INJECTED IN A MOLDING CAVITY AT HIGH PRESSURE THEREBY PARTIALLY SEPARATING THE SOLID CERAMIC MASS FROM THE LIQUID. THE COMPRESSED MASS IS FURTHER COMPRESSED BY A PRESSING DIE THEREBY REMOVING ALL THE REMAINING LIQUID FROM THE CERAMIC MASS. THE SEPARATED LIQUID IS REMOVED IN BIAXIAL DIRECTIONS FROM THE MOLDING CAVITY. THE CERAMIC MASS IS MAGNETIZED DURING THE INJECTION AND PRESSING OPERATIONS.
Inventors
- 👤 Eduard Johannes Haes
- 👤 Adrianus Theodorus Van De Maat
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 22:24
CPC Classifications
B; B28; B28B; B28B13/00; B28B13/02; B28B13/0215; B28B13/0275; B28B1/00; B28B1/24; B28B1/26; B28B1/265; B28B3/00; B28B3/02; B28B7/00; B28B7/40; B28B7/46; C; C04; C04B; C04B35/00; C04B35/01; C04B35/26; H; H01; H01F; H01F13/00; H01F13/003; H02; H02K; H02K15/00; H02K15/02; H02K15/03
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) | 1975-01-10 | 1975-07-12 | 1976-01-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-10 | 1979-07-12 | 1980-01-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-10 | 1983-07-12 | 1984-01-11 | $7700.00 | Window Closed / Lapsed |